Cov Lus Nug Piv Txwv ntawm Coulomb Force

9 Piv txwv ntawm Coulomb Force Cov Lus Nug

1. Peb lub thauj khoom tau teeb tsa raws li hauv daim duab hauv qab no. Lub zog Coulomb uas raug los ntawm lub zog B yog .... (k = 9 x 109 Nm2C-2, 1 μC = 10-6 C)
Piv txwv ntawm Coulomb Force Lo lus nug 1

A. 09 x 10 1 N kom them C

B. 09 x 10 1 N kom them A

C. 18 x 10 1 N kom them C

D. 18 x 10 1 N kom them A

E. 36 x 10 1 N kom them C

Kev Sib Tham

Nws yog paub tias :

q A = 10 µC = 10 x 10 -6 C = 10 -5 Coulombs

q B = 10 µC = 10 x 10 -6 = 10 -5 Coulombs

q C = 20 µC = 20 x 10 -6 = 2 x 10 -5 Coulombs

r AB = 0,1 meters = 10 -1 meters

r BC = 0,1 meters = 10 -1 meters

k = 9 x 10 9 Nm 2 C −2

Nug : Lub zog Coulomb raug kev txom nyem los ntawm tus nqi B

Lus teb :

Muaj ob lub zog Coulomb lossis lub zog hluav taws xob uas ua rau lub zog B, uas yog lub zog Coulomb ntawm cov nqi A thiab B (F AB ) thiab lub zog Coulomb ntawm cov nqi B thiab C (F BC ). Lub zog Coulomb uas lub zog B ntsib yog qhov tshwm sim ntawm F AB thiab F BC.

Lub zog Coulomb ntawm cov nqi A thiab B:

Piv txwv ntawm Coulomb Force Lo lus nug 2

Tus nqi A yog qhov zoo thiab tus nqi B yog qhov zoo yog li F AB mus rau tus nqi C.

Lub zog Coulomb ntawm cov nqi B thiab C:

Piv txwv ntawm Coulomb Force Lo lus nug 3

Tus nqi B yog qhov zoo thiab tus nqi C yog qhov zoo yog li F BC mus rau tus nqi A.

Lub zog Coulomb uas raug los ntawm tus nqi B:

F B = F BC – F AB = 180-90 = 90 N

Qhov loj ntawm lub zog Coulomb uas raug los ntawm lub zog B (F B ) yog 90 Newtons. Lub zog ntawm F B yog tib yam li lub zog ntawm F BC , uas yog mus rau lub zog A.

Cov lus teb yog B.

2. Qhov loj thiab kev coj ntawm lub zog Coulomb ntawm tus nqi B yog... ( k = 9 x 10 9 Nm 2 C −2 , 1 μC = 10 −6 C)

Piv txwv ntawm Coulomb Force Lo lus nug 4

A. 2,5 k Q 2 r -2 mus rau sab laug

B. 2,5 k Q 2 r -2 mus rau sab xis

C. 2 k Q 2 r -2 mus rau sab laug

D. 2 k Q 2 r -2 mus rau sab xis

E. 1 k Q 2 r -2 mus rau sab laug

Kev Sib Tham

Nws yog paub tias :

Tus nqi A (q A ) = +Q

Tus nqi B (q B ) = -2Q

Them C (q C ) = -Q

Qhov nrug ntawm cov nqi A thiab B (r AB ) = r

Qhov nrug ntawm cov nqi B thiab C (r BC ) = 2r

k = 9 x 10 9 Nm 2 C −2

Nug : qhov loj thiab kev coj ntawm Coulomb lub zog ntawm tus nqi B

Lus teb :

Lub zog Coulomb ntawm tus nqi A thiab tus nqi B:

Piv txwv ntawm Coulomb Force Lo lus nug 5

Tus nqi A yog qhov zoo thiab tus nqi B yog qhov tsis zoo yog li ntawd qhov kev taw qhia ntawm F AB yog mus rau tus nqi A

Lub zog Coulomb ntawm tus nqi B thiab tus nqi C:

Piv txwv ntawm Coulomb Force Lo lus nug 6

Tus nqi B yog qhov tsis zoo thiab tus nqi C yog qhov tsis zoo yog li qhov kev taw qhia ntawm F BC yog mus rau tus nqi A

Lub zog ua rau lub zog B:

F = F AB + F BC = 2 k Q 2 /r 2 + 0,5 k Q 2 /r 2 = 2,5 k Q 2 /r 2 = 2,5 k Q 2 r -2

Qhov kev taw qhia ntawm lub zog Coulomb yog mus rau qhov them A lossis mus rau sab laug.

Cov lus teb yog lawm yog A.

3. Ob lub zog hluav taws xob raug muab tso rau nyias raws li qhia hauv daim duab. Lub zog ntawm A yog 8 µC thiab lub zog nyiam uas ua rau ob lub zog yog 45 N. Yog tias lub zog A raug txav mus rau sab xis los ntawm 1 cm thiab k = 9.10 9 Nm 2 .C -2 , ces lub zog nyiam uas ua rau ob lub zog yog…

A. 45 NPiv txwv ntawm Coulomb Force Lo lus nug 7

B. 60 N

C. 80 N

D. 90 N

Sab Hnub Tuaj 120 N

Kev Sib Tham

Nws yog paub tias :

Lub zog hluav taws xob ntawm A (qA ) = 8 µC = 8 x 10 -6 Coulombs

Lub zog hluav taws xob ntawm ob lub nqi (F) = 45 Newton

Qhov nrug ntawm ob lub nqi (r AB ) = 4 cm = 0,04 meters = 4 x 10 -2 meters

Qhov ruaj khov (k) = 9 x 10 9 Nm 2 .C -2

Lo lus nug : Lub zog hluav taws xob ntawm ob lub nqi yog tias lub nqi A raug txav mus rau sab xis los ntawm 1 cm lossis 0,01 meters

Lus teb :

Ua ntej xam qhov hluav taws xob ntawm B, tom qab ntawd xam lub zog hluav taws xob ntawm ob qhov hluav taws xob, yog tias qhov hluav taws xob ntawm A raug txav mus rau sab xis los ntawm 1 cm.

Lub zog fais fab ntawm B :

Cov mis Txoj cai Coulomb :

F = k(qA ) (qB ) / r2

Fr2 = k( qA ) ( qB )

q B = Fr2 / k (q A )

Lub zog fais fab ntawm B :

qB = ( 45 )(4 x 10 -2 ) 2 / (9 x 10 9 )(8 x 10 -6 )

qB = (45)(16 x 10 -4 ) / 72 x 10 3

qB = (720 x 10 -4 ) / (72 x 10 3 )

qB = 10 x 10 -7 Coulombs

Lub zog hluav taws xob ntawm cov nqi hluav taws xob A thiab B :

Yog tias tus nqi ntawm A raug txav mus rau sab xis los ntawm 1 cm, qhov kev ncua deb ntawm ob tus nqi dhau los ua 3 cm = 0,03 meters = 3 x 10 -2 meters

F = k(qA ) (qB ) / r2

F = (9 x 10 9 )(8 x 10 -6 )(10 x 10 -7 ) / (3 x 10 -2 ) 2

F = (9 x 10 9 )(80 x 10 -13 ) / (9 x 10 -4 )

F = (1 x 10 9 )(80 x 10 -13 ) / (1 x 10 -4 )

F = (80 x 10 -4 ) / (1 x 10 -4 )

F = 80 Newtons

Cov lus teb yog C.

4. Ob lub zog fais fab P thiab Q uas sib nrug deb 10 cm muaj lub zog nyiam 8 N. Yog tias lub zog Q txav mus rau lub zog P (1 µC = 10 -6 C thiab k = 9 x 10 9 Nm 2 .C -2 ), ces lub zog fais fab uas tshwm sim yog...

A. 8 NPiv txwv ntawm Coulomb Force Lo lus nug 8

B. 16 N

C. 32 N

D. 40 N

Sab Hnub Tuaj 56 N

Kev Sib Tham

Nws yog paub tias :

Qhov nrug ntawm cov nqi P thiab Q (r PQ ) = 10 cm = 0,1 m = 1 x 10 -1 m

Lub zog hluav taws xob ntawm cov nqi P thiab Q (F) = 8 N

Lub zog hluav taws xob Q (q Q ) = 40 µC = 40 x 10 -6 C

Qhov ruaj khov (k) = 9 x 10 9 Nm 2 .C -2

Lo lus nug : Lub zog hluav taws xob ntawm cov nqi P thiab Q yog tias cov nqi Q raug txav 5 cm mus rau cov nqi P

Lus teb :

Ua ntej, xam qhov hluav taws xob P, tom qab ntawd xam lub zog hluav taws xob ntawm ob lub hluav taws xob, yog tias lub hluav taws xob Q txav mus rau qhov hluav taws xob P 5 cm.

Lub zog hluav taws xob P :

q P = Fr2 / k (q Q )

q P = (8)(1 x 10 -1 ) 2 / (9 x 10 9 )(40 x 10 -6 )

q P = (8)(1 x 10 -2 ) / 360 x 10 3

qP = (8 x 10 -2 ) / (36 x 10 4 )

qP = (1 x 10 -2 ) / (4,5 x 10 4 )

q P = (1/4,5) x 10 -6 Coulomb

Lub zog hluav taws xob ntawm cov nqi hluav taws xob P thiab Q :

Yog tias tus nqi ntawm Q raug txav mus rau sab laug los ntawm 5 cm, qhov kev ncua deb ntawm ob tus nqi dhau los ua 5 cm = 0,05 meters = 5 x 10 -2 meters

F = k(qP ) (qQ ) / r2

F = (9 x 10 9 )( (1/4,5) x 10 -6 )(40 x 10 -6 ) / (5 x 10 -2 ) 2

F = (2 x 10 3 )(40 x 10 -6 ) / (25 x 10 -4 )

F = (80 x 10 -3 ) / (25 x 10 -4 )

F = 3,2 x 10 1

F = 32 Newtons

Cov lus teb yog C.

5. Saib daim duab hauv qab no ntawm cov nqi hluav taws xob. Lub zog hluav taws xob uas lub zog q B ntsib yog 8 N (1 µC = 10 -6 C) thiab (k = 9.10 9 Nm 2 .C -2 ). Yog tias lub zog q B raug hloov mus rau 4 cm ntawm A, ces lub zog hluav taws xob uas q B ntsib tam sim no yog…

A. 2 NPiv txwv ntawm Coulomb Force Lo lus nug 9

B. 4 N

C. 6 N

D. 8 N

Sab Hnub Tuaj 10 N

Kev Sib Tham

Nws yog paub tias :

Qhov nrug ntawm cov nqi A thiab B (r AB ) = 2 cm = 0,02 m = 2 x 10 -2 m

Lub zog hluav taws xob ntawm cov nqi A thiab B (F) = 8 N

Lub zog hluav taws xob A (q A ) = 2 µC = 2 x 10 -6 C

Qhov ruaj khov (k) = 9 x 10 9 Nm 2 .C -2

Lo lus nug : Lub zog hluav taws xob ntawm cov nqi A thiab B yog tias qhov deb ntawm ob qho nqi yog 4 cm

Lus teb :

Ua ntej xam tus nqi hluav taws xob B, tom qab ntawd xam lub zog hluav taws xob ntawm ob tus nqi hluav taws xob yog tias qhov deb ntawm ob tus nqi hluav taws xob yog 4 cm = 0,04 meters = 4 x 10 -2 meters.

Lub zog fais fab B :

q B = Fr2 / k (q A )

qB = ( 8 )(2 x 10 -2 ) 2 / (9 x 10 9 )(2 x 10 -6 )

qB = (8)(4 x 10 -4 ) / (18 x 10 3 )

qB = (32 x 10 -4 ) / (18 x 10 3 )

qB = (32/18) x 10 -7

qB = (16/9) x 10 -7 Coulombs

Lub zog hluav taws xob ntawm cov nqi A thiab B :

F = k(qA ) (qB ) / r2

F = (9 x 10 9 )(2 x 10 -6 )((16/9) x 10 -7 ) / (4 x 10 -2 ) 2

F = (18 x 10 3 )( (16/9) x 10 -7 ) / (16 x 10 -4 )

F = (2 x 10 3 )(16 x 10 -7 ) / (16 x 10 -4 )

F = (2 x 10 3 )(1 x 10 -7 ) / (1 x 10 -4 )

F = (2 x 10 -4 ) / (1 x 10 -4 )

F = 2 Newtons

Cov lus teb yog lawm yog A.

6. Muaj peb lub zog fais fab nyob rau ntawm cov ces kaum ntawm daim duab peb sab ABC nrog sab ntev AB = BC = 20 cm thiab tib lub zog fais fab (q = 2µC) zoo li hauv daim duab ntawm sab (k = 9.10 9 Nm 2 .C -2 , 1 µ = 10 -6 ). Qhov loj ntawm lub zog fais fab ua rau ntawm qhov B yog….

A. 0,9√3 NPiv txwv ntawm Coulomb Force Lo lus nug 10

B. 0,9√2 N

C. 0,9 N

D. 0,81 N

Sab Hnub Tuaj 0,4 N

Kev Sib Tham

Nws paub tias:

Them ntawm qhov chaw A (q A ) = 2 µC = 2 x 10 -6 Coulomb

Them ntawm qhov chaw B (qB ) = 2 µC = 2 x 10 -6 Coulomb

Them ntawm qhov chaw C (qC ) = 2 µC = 2 x 10 -6 Coulomb

Qhov Nrug B mus rau C (r BC ) = 20 cm = 0,2 meters = 2 x 10 -1 meters

Qhov Nrug B mus rau A (r BA ) = 20 cm = 0,2 meters = 2 x 10 -1 meters

k = 9.10 9 Nm2 .C - 2

Lus Nug: Qhov loj ntawm lub zog hluav taws xob ua rau ntawm qhov chaw B

Lus teb:

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab C:

F BC = k (q B )(q C ) / r BC 2

F BC = (9 x 10 9 )(2 x 10 -6 )(2 x 10 -6 ) / (2 x 10 -1 ) 2

F BC = (9 x 10 9 )(4 x 10 -12 ) / (4 x 10 -2 )

F BC = (36 x 10 -3 ) / (4 x 10 -2 )

F BC = 9 x 10 -1

F BC = 0,9 Newton

Lub zog hluav taws xob ntawm cov ntsiab lus B thiab C yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F BC yog mus rau sab laug, deb ntawm qhov chaw C.

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab A:

F BA = k (q B )(q A ) / r BA 2

F BA = (9 x 10 9 )(2 x 10 -6 )(2 x 10 -6 ) / (2 x 10 -1 ) 2

F BA = (9 x 10 9 )(4 x 10 -12 ) / (4 x 10 -2 )

F BA = (36 x 10 -3 ) / (4 x 10 -2 )

F BA = 9 x 10 -1

F BA = 0,9 Newton

Lub zog hluav taws xob ntawm cov ntsiab lus B thiab A yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F BA yog nqes mus, deb ntawm qhov chaw A.

Ob lub zog hluav taws xob tsim ib lub kaum sab xis, yog li ntawd lub zog hluav taws xob tshwm sim ntawm qhov chaw B yog suav los ntawm kev siv cov qauv Pythagorean.

Piv txwv ntawm Coulomb Force Lo lus nug 11

Cov lus teb yog B.

7. Saib daim duab hauv qab no!

Peb lub zog Q 1 , Q 2 , thiab Q 3 nyob rau ntawm cov ntsis ntawm lub duab peb sab ABC. Qhov ntev ntawm AB = BC = 30 cm. Muab k = 9.10 9 Nm 2 .C -2 thiab 1 µ = 10 -6 ces lub zog Coulomb tshwm sim ntawm lub zog Q 1 yog….

A. 1 NPiv txwv ntawm Coulomb Force Lo lus nug 12

B. 5 N

C. 7 N

D. 10 N

Sab Hnub Tuaj 12 N

Kev Sib Tham

Nws paub tias:

Them ntawm qhov chaw A (q A ) = 3 µC = 3 x 10 -6 Coulomb

Them ntawm qhov chaw B (qB ) = -10 µC = -10 x 10 -6 Coulomb

Them ntawm qhov chaw C (qC ) = 4 µC = 4 x 10 -6 Coulomb

Qhov Nrug B mus rau C (r BC ) = 30 cm = 0,3 meters = 3 x 10 -1 meters

Qhov Nrug B mus rau A (r BA ) = 30 cm = 0,3 meters = 3 x 10 -1 meters

k = 9.10 9 Nm2 .C - 2

Lus Nug: Lub zog Coulomb uas tshwm sim ntawm qhov chaw B

Lus teb:

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab C:

F BC = k (q B )(q C ) / r BC 2

F BC = (9 x 10 9 )(10 x 10 -6 )(4 x 10 -6 ) / (3 x 10 -1 ) 2

F BC = (9 x 10 9 )(40 x 10 -12 ) / (9 x 10 -2 )

F BC = (360 x 10 -3 ) / (9 x 10 -2 )

F BC = 40 x 10 -1

F BC = 4 Newton

Lub zog hluav taws xob ntawm qhov chaw B yog qhov tsis zoo thiab lub zog hluav taws xob ntawm qhov chaw C yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F BC yog mus rau sab xis mus rau qhov chaw C.

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab A:

F BA = k (q B )(q A ) / r BA 2

F BA = (9 x 10 9 )(10 x 10 -6 )(3 x 10 -6 ) / (3 x 10 -1 ) 2

F BA = (9 x 10 9 )(30 x 10 -12 ) / (9 x 10 -2 )

F BA = (270 x 10 -3 ) / (9 x 10 -2 )

F BA = 30 x 10 -1

F BA = 3 Newton

Lub zog hluav taws xob ntawm qhov chaw B yog qhov tsis zoo thiab lub zog hluav taws xob ntawm qhov chaw A yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob FBA yog nce mus rau qhov chaw A.

Ob lub zog hluav taws xob tsim ib lub kaum sab xis, yog li ntawd lub zog hluav taws xob tshwm sim ntawm qhov chaw B yog suav los ntawm kev siv cov qauv Pythagorean.

Piv txwv ntawm Coulomb Force Lo lus nug 13

Cov lus teb yog B.

8. Peb lub zog fais fab tau muab tso rau ntawm cov ces kaum ntawm daim duab peb sab ABC nrog sab ntev AB = BC = 20 cm thiab tib lub zog fais fab (q = 2µC) zoo li hauv daim duab ntawm sab (k = 9.10).9 Nm2.C-2, 1 µ = 10-6). Qhov loj ntawm lub zog hluav taws xob Piv txwv ntawm Coulomb Force Lo lus nug 14ua haujlwm ntawm qhov chaw B yog ....

  1. 0,9√3 N
  2. 0,9√2 N
  3. 0,9 N
  4. 0,81 N
  5. 0,4 N

Kev Sib Tham

Nws paub tias:
Lub zog them ntawm qhov chaw A (q)A) = 2 µC = 2 x 10-6 Coulomb
Lub zog them ntawm qhov chaw B (q)B) = 2 µC = 2 x 10-6 Coulomb
Lub zog them ntawm qhov chaw C (q)C) = 2 µC = 2 x 10-6 Coulomb
Qhov nrug ntawm B mus rau C (r)BC) = 20 cm = 0,2 meters = 2 x 10-1 'meter'
Qhov Nrug Deb ntawm B mus rau A (r)BA) = 20 cm = 0,2 meters = 2 x 10-1 'meter'
k = 9.10 hli9 Nm2.C-2
Nug: Qhov loj ntawm lub zog hluav taws xob ua haujlwm ntawm qhov chaw B
Lus teb:

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab C:
FBC = k (q)B)(qC) / rBC2
FBC = (9 x 109)(2 x 10-6)(2 x 10-6) / (2 x 10-1)2
FBC = (9 x 109)(4 x 10-12) / (4 x 10-2)
FBC = (36 x 10-3) / (4 x 10-2)
FBC Luas = 9 x 10-1
FBC = 0,9 Newtons
Lub zog hluav taws xob ntawm cov ntsiab lus B thiab C yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F yogBC mus rau sab laug, deb ntawm qhov C.

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab A:
FBA = k (q)B)(qA) / rBA2
FBA = (9 x 109)(2 x 10-6)(2 x 10-6) / (2 x 10-1)2
FBA = (9 x 109)(4 x 10-12) / (4 x 10-2)
FBA = (36 x 10-3) / (4 x 10-2)
FBA Luas = 9 x 10-1
FBA = 0,9 Newtons
Lub zog hluav taws xob ntawm cov ntsiab lus B thiab A yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F yogBA down, deb ntawm qhov A.

Ob lub zog hluav taws xob tsim ib lub kaum sab xis, yog li ntawd lub zog hluav taws xob tshwm sim ntawm qhov chaw B yog suav los ntawm kev siv cov qauv Pythagorean.
Piv txwv ntawm Coulomb Force Lo lus nug 15Cov lus teb yog B.

9. Saib daim duab hauv qab no!
Peb qhov nqi Q1, Q2, thiab Q3 nyob rau ntawm qhov kawg ntawm lub duab peb sab xis ABC. Qhov ntev ntawm AB = BC = 30 cm. Nws paub tias Piv txwv ntawm Coulomb Force Lo lus nug 16k = 9.10 hli9 Nm2.C-2 thiab 1 µ = 10-6 ces qhov tshwm sim Coulomb zog ntawm tus nqi Q1 yog ....

  1. 1 N
  2. 5 N
  3. 7 N
  4. 10 N
  5. 12 N

Kev Sib Tham
Nws paub tias:
Lub zog them ntawm qhov chaw A (q)A) = 3 µC = 3 x 10-6 Coulomb
Lub zog them ntawm qhov chaw B (q)B) = -10 µC = -10 x 10-6 Coulomb
Lub zog them ntawm qhov chaw C (q)C) = 4 µC = 4 x 10-6 Coulomb
Qhov nrug ntawm B mus rau C (r)BC) = 30 cm = 0,3 meters = 3 x 10-1 'meter'
Qhov Nrug Deb ntawm B mus rau A (r)BA) = 30 cm = 0,3 meters = 3 x 10-1 'meter'
k = 9.10 hli9 Nm2.C-2
Nug: Lub zog Coulomb tshwm sim ntawm qhov chaw B
Lus teb:
Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab C:
FBC = k (q)B)(qC) / rBC2
FBC = (9 x 109)(10 x 10-6)(4 x 10-6) / (3 x 10-1)2
FBC = (9 x 109)(40 x 10-12) / (9 x 10-2)
FBC = (360 x 10-3) / (9 x 10-2)
FBC Luas = 40 x 10-1
FBC = 4 Newtons
Lub zog hluav taws xob ntawm qhov chaw B yog qhov tsis zoo thiab lub zog hluav taws xob ntawm qhov chaw C yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F yogBC mus rau sab xis ntawm qhov chaw C.

Lub zog hluav taws xob ntawm cov nqi ntawm cov ntsiab lus B thiab A:
FBA = k (q)B)(qA) / rBA2
FBA = (9 x 109)(10 x 10-6)(3 x 10-6) / (3 x 10-1)2
FBA = (9 x 109)(30 x 10-12) / (9 x 10-2)
FBA = (270 x 10-3) / (9 x 10-2)
FBA Luas = 30 x 10-1
FBA = 3 Newtons
Lub zog hluav taws xob ntawm qhov chaw B yog qhov tsis zoo thiab lub zog hluav taws xob ntawm qhov chaw A yog qhov zoo, yog li ntawd qhov kev taw qhia ntawm lub zog hluav taws xob F yogBA mus rau qhov chaw A.
 
Ob lub zog hluav taws xob tsim ib lub kaum sab xis, yog li ntawd lub zog hluav taws xob tshwm sim ntawm qhov chaw B yog suav los ntawm kev siv cov qauv Pythagorean.
Piv txwv ntawm Coulomb Force Lo lus nug 18Cov lus teb yog B.

Qhov chaw nug lus:

Cov Lus Nug Txog Kev Xeem Physics Hauv Tebchaws Rau Tsev Kawm Ntawv Theem Siab/Tsev Kawm Ntawv Theem Siab Ua Haujlwm

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