Piv txwv ntawm cov lus nug txog hluav taws xob

1. Qhov chaw A nyob deb li ntawm 5 cm ntawm lub zog hluav taws xob ntawm +10 micro Coulombs. Qhov loj thiab kev coj ntawm lub zog hluav taws xob ntawm qhov chaw A yog… (k = 9 x 10⁹ Nm²C^-2, 1 micro Coulomb = 10^-6 C)
Kev Sib Tham
Nws yog paub :

Nug : Qhov loj thiab kev taw qhia ntawm lub zog hluav taws xob ntawm qhov chaw A
Jawb :

Kev taw qhia ntawm lub zog hluav taws xob ntawm qhov chaw A :
Lub zog hluav taws xob yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub teb hluav taws xob yog deb ntawm lub zog hluav taws xob thiab deb ntawm qhov chaw A.

2. Qhov nrug ntawm qhov chaw P thiab lub zog ntawm -20 micro Coulombs yog 10 cm. Txheeb xyuas lub zog ntawm lub zog hluav taws xob thiab kev coj ntawm lub zog hluav taws xob ntawm qhov chaw P.
Kev Sib Tham
Nws yog paub :

Nug Qhov loj thiab kev taw qhia ntawm lub zog hluav taws xob ntawm qhov chaw P
Jawb :

Kev taw qhia ntawm lub zog hluav taws xob ntawm qhov chaw A :
Tus nqi hluav taws xob yog qhov tsis zoo, yog li ntawd qhov kev taw qhia ntawm lub teb hluav taws xob yog mus rau tus nqi hluav taws xob thiab deb ntawm qhov chaw P.

3. Ob lub zog fais fab sib cais los ntawm qhov deb ntawm 40 cm. Lub zog fais fab thiab kev coj ntawm lub zog fais fab ntawm qhov chaw nyob hauv nruab nrab ntawm ob lub zog fais fab yog ...

Kev Sib Tham
Xav tias qhov chaw nyob nruab nrab ntawm ob qho nqi yog qhov chaw P.
Nws yog paub :

Nug : qhov loj thiab kev coj ntawm lub zog hluav taws xob ntawm qhov chaw nyob nruab nrab ntawm ob lub nqi (qhov chaw P)
Jawb :
Lub zog hluav taws xob uas tsim los ntawm tus nqi A ntawm qhov chaw P :

Tus nqi A yog qhov tsis zoo yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi A (mus rau sab laug).
Lub teb hluav taws xob uas tsim los ntawm tus nqi B ntawm qhov chaw P :

Tus nqi B yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob nyob deb ntawm tus nqi B (mus rau sab laug).
Lub zog hluav taws xob tshwm sim ntawm qhov chaw A :
E_A thiab E_B nyob rau hauv tib qho kev taw qhia yog li ntawd lawv raug ntxiv ua ke.
E = E_A Thiab_B
E = (4,5 x 10⁵) + (9 x 10⁵)
E = 13,5 x 10⁵ N / C
Lub zog hluav taws xob ntawm lub zog A mus rau sab laug thiab sab xis (mus rau sab laug).

4. Lub zog hluav taws xob yog xoom ntawm ib qho chaw ntawm qhov deb ntawm ...

Kev Sib Tham
Tus nqi A yog qhov zoo thiab tus nqi B yog qhov zoo, yog li lub zog hluav taws xob yog xoom, nyob hauv nruab nrab ntawm ob tus nqi. Xav tias qhov chaw uas lub zog hluav taws xob yog xoom yog qhov chaw P.
Nws yog paub :

Nug : lub zog hluav taws xob xoom nyob ntawm qhov chaw ntawm qhov deb ntawm…
Jawb :
Lub zog hluav taws xob uas tsim los ntawm tus nqi A ntawm qhov chaw P :

Tus nqi A yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob uas tsim los ntawm tus nqi A ntawm qhov chaw P yog deb ntawm tus nqi A (mus rau sab xis).
Lub teb hluav taws xob uas tsim los ntawm tus nqi B ntawm qhov chaw P :

Tus nqi B yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob uas tsim los ntawm tus nqi B ntawm qhov chaw P yog deb ntawm tus nqi B (mus rau sab laug).
Lub zog hluav taws xob tshwm sim ntawm qhov chaw P = 0 :
E_A thiab E_B kev taw qhia txawv.
E_A - E_B = 0
E_A = E_B

Siv cov qauv ABC los txiav txim siab tus nqi ntawm a.

Lub zog hluav taws xob xoom nyob ntawm qhov chaw 8 cm ntawm tus nqi A lossis 12 cm ntawm tus nqi B.

5. Qhov nrug ntawm ob lub roj teeb A thiab B yog 3 meters. Qhov chaw O nyob nruab nrab ntawm ob lub roj teeb thiab yog 2 meters ntawm lub roj teeb B. q_A = –300 μC thiab q_B = 600 μC. k = 9 × 10⁹ N m² C^-2Lub zog hluav taws xob ntawm qhov chaw O yog cuam tshuam los ntawm tus nqi q_A thiab q_B yog ...
A. 9 × 10⁵ N / C
B. 18 × 10⁵ N / C
C. 52 × 10⁵ N / C
D. 60 × 10⁵ N / C
E. 81 × 10⁵ N / C

Kev Sib Tham:
Nws yog paub :
q_A = –300 μC, q_B = 600 μC, k = k = 9 × 10⁹ N m² C^-2
Nug :
Lub zog hluav taws xob ntawm qhov chaw O yog dab tsi?
Jawb :
Lub zog teb tshwm sim:
E = E_A Thiab_B
E = (2700 x 10³ N/C) + (5400 x 10³ Tsis muaj/C)
E = 8100 x 10³ N / C
E = 81 x 10⁵ N / C
Cov lus teb yog yog E.

6. Ob lub nqi txhua ntawm q₁ = -20 μC thiab q₂ = -40 μC. Yog tias nyob ntawm qhov chaw P uas yog 20 cm ntawm q₂ lub zog hluav taws xob tshwm sim yog xoom, ces tus nqi x yog ...
A. 11 cm
B. 12 cm
C. 13 cm
D. 14 cm
E. 15 cm

Kev Sib Tham:
Nws yog paub :
q₁ = -20 μC, q₂ = -40 μC, r₂ = 0,2 m, r₁ = xwm
Nug :
Qhov deb ntawm qhov P ntawm q₁ (x) ?
Jawb :
Lub zog hluav taws xob tshwm sim yog xoom ntawm qhov chaw P:
Cov lus teb yog D.

7 TOs A nyob hauv nruab nrab ntawm ob lub nqi hluav taws xob uas muaj tib qhov loj tab sis sib txawv hom uas sib cais los ntawm qhov deb. Qhov loj ntawm lub zog hluav taws xob ntawm qhov chaw A thaum ntawd yog 36 NC^-1Yog tias qhov chaw A raug txav ¼ a ze rau ib qho ntawm cov nqi, ces qhov loj ntawm lub zog hluav taws xob ntawm qhov chaw A tom qab raug txav yog ....

A. 100 NC^-1

B. 96 NC^-1

C. 80 NC^-1

D. 60 NC^-1

E. 16 NC^-1

Kev Sib Tham

Nws yog paub :

Them 1 (q₁) = +Q

Them 2 (q₂) = -Q

Qhov nrug ntawm lub charge 1 thiab point A (r)_1A) = ½ ib

Qhov nrug ntawm lub charge 2 thiab point A (r)_2A) = ½ ib

Lub zog hluav taws xob ntawm qhov chaw A (E)_A) = 36 NC^-1

Nug Yog tias qhov chaw A raug txav ¼ a ze rau ib qho ntawm cov nqi, ces lub zog hluav taws xob ntawm qhov chaw A yog ...

Jawb :

Theem 1.

Yuav xam lub zog ntawm lub zog hluav taws xob ntawm qhov chaw A, xav tias muaj lub zog kuaj zoo ntawm qhov chaw ntawd. Qhov muaj lub zog kuaj zoo cuam tshuam rau qhov kev taw qhia ntawm lub zog hluav taws xob.

Lub teb hluav taws xob uas tsim los ntawm tus nqi + Q ntawm qhov chaw A :

Tus nqi kuaj yog qhov zoo thiab tus nqi 1 yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi 2.

Lub teb hluav taws xob uas tsim los ntawm tus nqi -Q ntawm qhov chaw A :

Tus nqi kuaj yog qhov zoo thiab tus nqi 2 yog qhov tsis zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi 2.

Lub zog hluav taws xob tshwm sim ntawm qhov chaw A :

Theem 2.

Yog tias qhov chaw A txav mus ze rau qhov them 1 ces:

Qhov nrug ntawm lub charge 1 thiab point A (r)_1A) = ¼ ib

Qhov nrug ntawm lub charge 2 thiab point A (r)_2A) = ¾ ib

Lub teb hluav taws xob uas tsim los ntawm tus nqi + Q ntawm qhov chaw A :

Tus nqi kuaj yog qhov zoo thiab tus nqi 1 yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi 2.

Lub teb hluav taws xob uas tsim los ntawm tus nqi -Q ntawm qhov chaw A :

Tus nqi kuaj yog qhov zoo thiab tus nqi 2 yog qhov tsis zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi 2.

Lub zog hluav taws xob tshwm sim ntawm qhov chaw A :

Cov lus teb yog C.

8. Ob lub khoom me me txhua tus muaj ib qho nqi q_A = 1 μC thiab q_B = 4 μC muab tso rau 4 cm sib nrug (k = 9 x 10⁹ N m² C^-2). Lub zog hluav taws xob hauv nruab nrab ntawm q_A thiab q_B yog ...

A. 6,75 x 10⁷ NC^-1

B. 4,50 x 10⁷ NC^-1

C. 4,20 x 10⁷ NC^-1

D. 3,60 x 10⁷ NC^-1

E. 2,25 x 10⁷ NC^-1

Kev Sib Tham

Nws yog paub :

Them A (q_A) = 1 μC = 1 x 10^-6 C

Tus nqi B (q_B) = 4 μC = 4 x 10^-6 C

k = 9 x 10⁹ N m² C^-2

Qhov nrug ntawm cov nqi A thiab B (r)_AB) = 4 cm = 0,04 meters

Qhov nrug ntawm tus nqi A thiab qhov nruab nrab (r)_A) = 0,02 'meter'

Qhov nrug ntawm tus nqi B thiab qhov nruab nrab (r)_B) = 0,02 'meter'

Nug : Lub zog hluav taws xob ntawm qhov chaw nruab nrab ntawm q_A thiab q_B yog ...

Jawb :

Yuav xam lub zog fais fab hauv nruab nrab q_A thiab q_B , xav tias muaj ib qho nqi kuaj zoo nyob hauv nruab nrab ntawm ob qho nqi. Qhov muaj ib qho nqi kuaj zoo cuam tshuam rau qhov kev coj ntawm lub teb hluav taws xob.

Lub zog hluav taws xob uas tsim los ntawm tus nqi A ntawm qhov nruab nrab :

Tus nqi kuaj yog qhov zoo thiab tus nqi A yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi B.

Lub zog hluav taws xob uas tsim los ntawm tus nqi B ntawm qhov nruab nrab :

Tus nqi kuaj yog qhov zoo thiab tus nqi B yog qhov zoo yog li qhov kev taw qhia ntawm lub zog hluav taws xob yog mus rau tus nqi A.

Lub zog hluav taws xob tshwm sim ntawm qhov chaw nruab nrab :

E_A thiab E_B kev taw qhia txawv.

E = E_B - E_A Luas = 9 x 10⁷ - 2,25 x 10⁷ Luas = 6,75 x 10⁷ NC^-1

Cov lus teb yog lawm yog A.

9. Saib daim duab ntawm ob lub ntsiab lus them nqi hauv qab no! Qhov chaw P nyob qhov twg kom lub zog hluav taws xob ntawm qhov chaw P sib npaug rau xoom? (k = 9 x 10⁹ Nm²C^-2, 1 μC = 10^-6 C)

A. nyob nruab nrab ntawm Q₁ thiab Q₂

B. 6 cm rau sab xis ntawm Q₂

C. 6 cm rau sab laug ntawm Q₁

D. 2 cm rau sab xis ntawm Q₂

E. 2 cm rau sab laug ntawm Q₁

Kev Sib Tham

Yuav xam lub zog hluav taws xob ntawm qhov chaw P, xav tias muaj qhov them nqi kuaj zoo ntawm qhov chaw P. Q.₁ zoo thiab Q₂ tsis zoo, yog li ntawd qhov P yuav tsum nyob rau sab xis ntawm Q₂ los yog sab laug ntawm Q₁. Yog tias qhov chaw P nyob rau sab laug ntawm Q₁lub teb hluav taws xob uas tsim los ntawm qhov Q₁ ntawm qhov chaw P qhov kev taw qhia yog sab laug (deb ntawm Q₁) thiab lub zog hluav taws xob tsim Q₂ ntawm qhov chaw P qhov kev taw qhia yog mus rau sab xis (mus rau Q)₁). Vim tias qhov kev taw qhia ntawm lub zog hluav taws xob nyob rau sab nraud, ob qho tib si tshem tawm ib leeg kom lub zog hluav taws xob ntawm qhov chaw P yog xoom.

Nws yog paub :

Q₁ = +9 μC = +9 x 10^-6 C

Q₂ = -4 μC = -4 x 10^-6 C

k = 9 x 10⁹ Nm²C^-2

Qhov nrug ntawm tus nqi 1 thiab tus nqi 2 = 3 cm

Qhov nrug ntawm Q₁ thiab qhov chaw P (r_1P) = ib

Qhov nrug ntawm Q₂ thiab qhov chaw P (r_2P) = 3 cm + ib

Nug : Qhov chaw P nyob qhov twg kom lub zog hluav taws xob ntawm qhov chaw P sib npaug rau xoom?

Jawb :

Point P yog sab laug ntawm Q₁.

Lub zog hluav taws xob tshwm sim ntawm qhov chaw A :

Siv cov qauv ABC los txiav txim siab tus nqi ntawm a.

10. Saib daim duab hauv qab no! Them q₃ muab tso rau ntawm qhov deb ntawm 5 cm ntawm q₂, ces lub zog hluav taws xob ntawm lub zog them q₃ yog… (1 µC = 10^-6 C)

A. 4,6 x 10⁷ NC^-1

B. 3,6 x 10⁷ NC^-1

C. 1,6 x 10⁷ NC^-1

D. 1,4 x 10⁷ NC^-1

E. 1,3 x 10⁷ NC^-1

Kev Sib Tham

Them q₃ muab tso rau ntawm qhov deb ntawm 5 cm ntawm q₂, lub ntsiab lus tsis nyob rau sab laug ntawm q₂ tab sis ntawm sab xis q₂Yog tias nyob rau sab laug q₂ ces qhov hluav taws xob tshwm sim yog xoom. Qhov no yog vim qhov kev ncua deb ntawm cov nqi q₃ nrog lub zog q₁ thiab q₂ yog 5 cm thiab qhov loj ntawm lub nqi yog q₁ sib npaug rau tus nqi q₂.

Vim yog qhov them q₃ zoo ces coj mus lub zog hluav taws xob ntawm lub zog q₃ mus rau qhov them tsis zoo q₂ (E₂) thiab deb ntawm qhov them zoo q₁ (E₁). Lub zog hluav taws xob tshwm sim yog qhov sib sau ua ke ntawm lub zog hluav taws xob E₁ thiab E₂.

Nws yog paub :

Them q₁ = 5 µC = 5 x 10^-6 Coulomb

Them q₂ = 5 µC = -5 x 10^-6 Coulomb

Qhov nrug ntawm cov nqi q₁ thiab them q₃ (r₁) = 15 cm = 0,15 m = 15 x 10^-2 'meter'

Qhov nrug ntawm cov nqi q₂ thiab them q₃ (r₂) = 5 cm = 0,05 m = 5 x 10^-2 'meter'

k = 9 x 10⁹ N m² C^-2

Nug Lub zog ntawm lub zog hluav taws xob thaum them q₃

Jawb :

Lub zog hluav taws xob 1

E₁ = kq₁ / r ib₁²

E₁ = (9 x 10⁹)(5 x 10^-6) / (15 x 10^-2)²

E₁ = (45 x 10³) / (225 x 10^-4)

E₁ Luas = 0,2 x 10⁷ N / C

Lub zog hluav taws xob 2

E₂ = kq₂ / r ib₂²

E₂ = (9 x 10⁹)(5 x 10^-6) / (5 x 10^-2)²

E₂ = (45 x 10³) / (25 x 10^-4)

E₂ Luas = 1,8 x 10⁷ N / C

Lub zog hluav taws xob tshwm sim

Lub zog hluav taws xob tshwm sim ntawm qhov them q₃ yog:

E = E₂ - E₁ = (1,8 x 10⁷) – (0,2 x 10⁷) = 1,6 x 10⁷ N / C

Lub zog hluav taws xob yog mus rau sab laug los yog nyob rau hauv lub zog E₂.

Cov lus teb yog C.

11. Ob lub nqi hluav taws xob raug sib cais raws li qhia hauv daim duab. Lub zog hluav taws xob ntawm qhov chaw P yog… (k = 9 x 10⁹ N m² C^-2)

A. 9,0 x 10⁹ NC^-1

B. 4,5 x 10⁹ NC^-1

C. 3,6 x 10⁹ NC^-1

D. 5,4 x 10⁹ NC^-1

E. 4,5 x 10⁹ NC^-1

Kev Sib Tham

Nws yog paub :

Them q_A = +2,5 C

Them q_B = -2 C

Qhov nrug ntawm cov nqi q_A thiab qhov chaw P (r_A) = 5 m

Qhov nrug ntawm cov nqi q_B thiab qhov chaw P (r_B) = 2 m

k = 9 x 10⁹ N m² C^-2

Nug Lub zog hluav taws xob ntawm qhov chaw P

Jawb :

Lub zog hluav taws xob A

E_A = kq_A / r ib_A²

E_A = (9 x 10⁹)(2,5) / (5)²

E_A = (22,5 x 10⁹) / 25 tauj

E_A Luas = 0,9 x 10⁹ N / C

Lub zog hluav taws xob B

E_B = kq_B / r ib_B²

E_B = (9 x 10⁹)(2) / (2)²

E_B = (18 x 10⁹) / 4 tauj

E_B Luas = 4,5 x 10⁹ N / C

Lub zog hluav taws xob tshwm sim

Lub zog hluav taws xob tshwm sim ntawm qhov chaw P yog:

E = E_B - E_A = (4,5 – 0,9) x 10⁹ Luas = 3,6 x 10⁹ N / C

Lub zog hluav taws xob yog mus rau sab laug los yog nyob rau hauv lub zog E_B.

Cov lus teb yog C.

12. Ob lub nqi hluav taws xob txhua tus muaj tus nqi Q₁ = -40 µC thiab Q₂ = +5 µC nyob rau ntawm qhov chaw raws li qhia hauv daim duab (k = 9 x 10⁹ Nm².C^-2 thiab 1 µC = 10^-6 C), lub zog hluav taws xob ntawm qhov chaw P yog ...

A. 2,25 x 10⁶ NC^-1

B. 2,45 x 10⁶ NC^-1

C. 5,25 x 10⁶ NC^-1

D. 6,75 x 10⁶ NC^-1

E. 9,00 x 10⁶ NC^-1

Kev Sib Tham

Nws yog paub :

Them q₁ = -40 µC = -40 x 10^-6 C

Them q₂ = +5 µC = +5 x 10^-6 C

Qhov nrug ntawm cov nqi q₁ thiab qhov chaw P (r₁) = 40 cm = 0,4 m = 4 x 10^-1 m

Qhov nrug ntawm cov nqi q₂ thiab qhov chaw P (r₂) = 10 cm = 0,1 = 1 x 10^-1 m

k = 9 x 10⁹ N m² C^-2

Nug Lub zog hluav taws xob ntawm qhov chaw P

Jawb :

Lub zog hluav taws xob 1

E₁ = kq₁ / r ib₁²

E₁ = (9 x 10⁹)(40 x 10^-6) / (4 x 10^-1)²

E₁ = (360 x 10³) / (16 x 10^-2)

E₁ Luas = 22,5 x 10⁵ N / C

Lub zog hluav taws xob 2

E₂ = kq₂ / r ib₂²

E₂ = (9 x 10⁹)(5 x 10^-6) / (1 x 10^-1)²

E₂ = (45 x 10³) / 1 x 10^-2

E₂ Luas = 45 x 10⁵ N / C

Lub zog hluav taws xob tshwm sim

Lub zog hluav taws xob tshwm sim ntawm qhov chaw P yog:

E = E₂ - E₁ = (45 – 22,5) x 10⁵ Luas = 22,5 x 10⁵ N / C

E = 2,25 x 10⁶ N / C

Lub zog hluav taws xob yog mus rau sab xis los yog nyob rau hauv lub zog E₂.

Cov lus teb yog lawm yog A.

13. Los ntawm cov duab them hauv qab no, uas qhia cov kab ntawm lub zog ntawm ob lub nqi ze ua ke yog ...

Kev Sib Tham

Cov kab hluav taws xob, lossis cov kab ntawm lub zog, raug kos los ntawm lub zog zoo mus rau lub zog tsis zoo. Yog tias lub zog zoo thiab lub zog tsis zoo raug muab tso ze ua ke, cov kab ntawm lub zog yuav tshwm sim zoo li cov lus teb A.

Cov lus teb yog lawm yog A.

8. Ob lub zog hluav taws xob raug coj los ze ua ke hauv ib txoj kab txuas, ua rau muaj cov kab hluav taws xob. Daim duab tseeb yog…

Kev Sib Tham

Cov lus teb yog D.

9. Cov kab ntawm lub zog raug ntawm ob qho kev them nqi yog ...

Kev Sib Tham

Cov lus teb yog D.

14. Saib daim duab hauv qab no ntawm ob lub ntsiab lus them nqi!

Qhov chaw P nyob qhov twg kom lub zog hluav taws xob ntawm qhov chaw P sib npaug rau xoom?

(k = 9.10⁹ Nm².C^-2, 1 µC = 10^-6 C)

A. 1 cm rau sab xis ntawm q₁

B. 1 cm rau sab xis ntawm q₂

C. ½ cm rau sab xis ntawm q₂

D. ½ cm rau sab laug ntawm q₁

E. ½ cm rau sab xis ntawm q₁

Kev Sib Tham

Nws paub tias:

Them 1 (q₁) = -9 µC = -9.10^-6 Coulomb

Them 2 (q₂) = 1 µC = 1.10^-6 Coulomb

Qhov deb ntawm q₁ thiab q₂ (r₁₂) = 1 cm

k = 9.10 hli⁹ Nm².C^-2

Nug: Qhov chaw P nyob qhov twg kom lub zog hluav taws xob ntawm qhov chaw P sib npaug rau xoom?

Lus teb:

E₁ = lub zog hluav taws xob tsim los ntawm q₁ ntawm qhov chaw P

Kev Taw Qhia E₁ mus rau q₁ vim q.₁ lub cim tsis zoo

E₂ = lub zog hluav taws xob tsim los ntawm q₂ ntawm qhov chaw P

Kev Taw Qhia E₂ nyob deb ntawm q₂ vim q.₂ lub cim zoo

r₁ = qhov deb ntawm P thiab q₁ = x + 1

r₂ = qhov deb ntawm P thiab q₂ = xwm

Lub zog hluav taws xob ntawm qhov chaw P yog sib npaug rau xoom:

Siv cov qauv ABC:

Qhov nrug ntawm P thiab q₂ = x = 0,5 cm.

Point P yog 0,5 cm rau sab xis ntawm q₂ los yog ntawm 0,25 cm rau sab laug ntawm q₁.

Cov lus teb yog C.

15 PUa tib zoo saib ob lub nqi uas nyob deb ntawm hauv qab no!

Yog tias lub zog hluav taws xob ntawm qhov chaw P yog k Q / x², ces tus nqi ntawm x yog….

A. 1/3 a

B. 2/3 a

C. ib

D. 3/2 a

E. 2a

Kev Sib Tham

Nws paub tias:

E_P = kQ / x²

Nug: tus nqi x

Lus teb:

Siv cov qauv ABC:

Cov lus teb yog lawm yog A.

16. Cov Lus Nug Txog Kev Xeem Hauv Tebchaws rau SMA/MA Physics U-ZC-2013/2014 No. 27

Saib daim duab hauv qab no ntawm ob lub ntsiab lus them nqi!

Qhov chaw P nyob qhov twg kom lub zog hluav taws xob ntawm qhov chaw P sib npaug rau xoom?
(k = 9.10⁹ Nm².C^-2, 1 µC = 10^-6 C)

1. 1 cm rau sab xis ntawm q₁
2. 1 cm rau sab xis ntawm q₂
3. ½ cm rau sab xis ntawm q₂
4. ½ cm rau sab laug ntawm q₁
5. ½ cm rau sab xis ntawm q₁

Kev Sib Tham
Nws paub tias:
Them 1 (q₁) = -9 µC = -9.10^-6 Coulomb
Them 2 (q₂) = 1 µC = 1.10^-6 Coulomb
Qhov deb ntawm q₁ thiab q₂ (r₁₂) = 1 cm
k = 9.10 hli⁹ Nm².C^-2
Nug: Qhov chaw P nyob qhov twg kom lub zog hluav taws xob ntawm qhov chaw P sib npaug rau xoom?
Lus teb:

E₁ = lub zog hluav taws xob tsim los ntawm q₁ ntawm qhov chaw P
Kev Taw Qhia E₁ mus rau q₁ vim q.₁ lub cim tsis zoo
E₂ = lub zog hluav taws xob tsim los ntawm q₂ ntawm qhov chaw P
Kev Taw Qhia E₂ nyob deb ntawm q₂ vim q.₂ lub cim zoo
r₁ = qhov deb ntawm P thiab q₁ = x + 1
r₂ = qhov deb ntawm P thiab q₂ = xwm

Lub zog hluav taws xob 1:
Lub zog hluav taws xob 2:

Lub zog hluav taws xob ntawm qhov chaw P yog sib npaug rau xoom:
a = 8, b = -2, c = -1
Siv cov qauv ABC:

Qhov nrug ntawm P thiab q₂ = x = 0,5 cm.
Point P yog 0,5 cm rau sab xis ntawm q₂ los yog ntawm 0,25 cm rau sab laug ntawm q₁.

Cov lus teb yog C.

17. Cov Lus Nug Txog Kev Xeem Hauv Tebchaws rau SMA/MA Physics U-ZC-2013/2014 No. 27

Xav txog ob lub nqi uas nyob deb ntawm a hauv qab no!
Yog tias lub zog hluav taws xob ntawm qhov chaw P yog k Q / x², ces tus nqi ntawm x yog….

1. 1/3 to
2. 2/3 to
3. a
4. 3/2 to
5. 2a

Kev Sib Tham
Nws paub tias:
E_P = kQ / x²
Nug: tus nqi x
Lus teb:
E₁ = lub zog hluav taws xob ntawm qhov chaw P los ntawm tus nqi -Q
r₁ = qhov deb ntawm lub charge –Q thiab qhov point P = x
E₂ = lub zog hluav taws xob ntawm qhov chaw P los ntawm tus nqi +32Q
r₂ = qhov deb ntawm lub zog them +32Q thiab qhov chaw P = a + x

Siv cov qauv ABC:

Cov lus teb yog lawm yog A.