Mphamvu yamagetsi - mavuto ndi mayankho
1. Ngati mphamvu yamagetsi yosasunthika ndi 144 N, mtunda pakati pa ma charge onse awiri ndi wotani … (1 μC = 10 -6 C ndi k = 9.10 9 Nm 2 .C -2 )
Zodziwika:
Mphamvu yamagetsi (F 12 ) = 144 N
Chaja 1 (q 1 ) = 10 μC = 10 x 10 -6 C
Chaja 2 (q 2 ) = 4 μC = 4 x 10 -6 C
Chokhazikika (k) = 9 x 10 9 Nm 2 .C -2
C = Coulomb, N = Newton, m = mita
Kufunidwa: Mtunda pakati pa zolipiritsa zonse ziwiri (r)
Yankho:
Kuyerekeza kwa lamulo la Coulomb :
F = mphamvu yamagetsi yosasinthasintha, k = chosasintha cha Coulomb, q = chaji yamagetsi, r = mtunda pakati pa chaji zonse ziwiri
Mtunda pakati pa ma charge onse awiri (r) = 5 x 10 -2 mamita = 5 x 10 -2 x 10 2 cm = 5 cm.
2. Ma charge awiri olekanitsidwa ndi mtunda wa r . Ngati mphamvu yamagetsi yosasunthika ndi 3.6 N, mtunda pakati pa ma charge onse awiri ndi wotani (1 μC = 10 -6 C ndi k = 9.10 9 Nm 2 .C -2 )
Zodziwika:
Mphamvu yamagetsi (F 12 ) = 3.6 N
Chaja 1 (q 1 ) = 9 μC = 9 x 10 -6 C
Chaja 2 (q 2 ) = 4 μC = 4 x 10 -6 C
Chosasintha cha Coulomb (k) = 9 x 10 9 Nm 2 .C -2
C = Coulomb, N = Newton, m = mita
Kufunidwa: Mtunda pakati pa zolipiritsa zonse ziwiri (r)
Yankho:
Mtunda pakati pa ma charge onse awiri (r) = 0.3 m = 0.3 x 100 cm = 30 cm.
3. Ma point charge atatu monga momwe zasonyezedwera pachithunzi chili pansipa. Kodi mphamvu yamagetsi yosasunthika ndi yotani pa mfundo A (k = 9.10 9 Nm 2 .C -2 ; 1 μ = 10 -6 )
Zodziwika:
kulipiritsa A (q)A) = -2 μC = -2 x 10-6 C
Chaja B (q B ) = 8 μC = 8 x 10 -6 C
Chaji C (q C ) = 4,5 μC = 4,5 x 10 -6 C
Chosasintha cha Coulomb (k) = 9 x 10 9 Nm 2 .C -2
Mtunda pakati pa zolipiritsa A ndi B (r AB ) = 4 cm = 4 x 10 -2 m
Mtunda pakati pa ma chaji A ndi C (r AC ) = 3 cm = 3 x 10 -2 m
C = Coulomb, N = Newton, m = mita
Kufunidwa: Mphamvu yamagetsi yosasinthasintha pamalo A
Yankho:
Kuyerekeza kwa lamulo la Coulomb:
F = mphamvu yamagetsi yosasinthasintha , k = chosasintha cha Coulomb , q = chaji yamagetsi , r = mtunda pakati pa chaji zonse ziwiri
Mphamvu yamagetsi yosasinthasintha pamalo A:
4. Ma charge a mfundo zitatu monga momwe zasonyezedwera pachithunzi chili pansipa. Kodi mphamvu ya Coulomb yomwe Charge B imagwira ntchito ndi yaikulu bwanji (k = 9.10 9 Nm 2 .C -2 ; 1 μC = 10 -6 C ).
Zodziwika:
q A = 10 µC = 10 x 10 -6 C = 10 -5 Coulombs
q B = 10 µC = 10 x 10 -6 = 10 -5 Ma Coulomb
q C = 20 µC = 20 x 10 -6 = 2 x 10 -5 Coulombs
r AB = mita 0.1 = 10 -1 m
r BC = 0.1 mita = 10 -1 m
k = 9 x 10 9 Nm 2 C −2
Akufuna: Gulu la Coulomb lomwe lidakumana ndi Charge B
Yankho:
Pali magulu awiri ankhondo a Coulomb omwe amagwira ntchito pa udindo B, mphamvu ya Coulomb pakati pa milandu A ndi B (F AB ) ndi mphamvu ya Coulomb pakati pa milandu B ndi C (F BC ). Mphamvu ya Coulomb yomwe imachitikira pa udindo B ndi mphamvu yeniyeni ya F AB ndi F BC.
Mphamvu ya Coulomb pakati pa milandu A ndi B:
Ndalama A yosainidwa kuti ndi yabwino ndipo ndalama B yosainidwa kuti ndi yabwino kotero kuti F AB iloze ku C.
Mphamvu ya Coulomb pakati pa milandu B ndi C:
Mlandu B wasainidwa kuti ndi wabwino ndipo mlandu C wasainidwa kuti ndi wabwino kotero kuti F BC imaloza ku mlandu A.
Mphamvu ya Coulomb yomwe imapezeka ndi mlandu B:
F B = F BC – F AB = 180 – 90 = 90 N
Mphamvu ya Coulomb yomwe imapezeka ndi chaji B (F B ) ndi 90 Newtons. Kulunjika kwa F B kuli kofanana ndi komwe F BC ikupita ku chaji A.
5. Dziwani kukula ndi njira ya mphamvu ya Coulomb pa mphamvu B ( k = 9 x 10 9 Nm 2 C −2 , 1 μC = 10 −6 C).
Zodziwika:
Ndalama A (q A ) = +Q
Ndalama B (q B ) = -2Q
Ndalama C (q C ) = -Q
Mtunda pakati pa zolipiritsa A ndi B (r AB ) = r
Mtunda pakati pa zolipiritsa B ndi C (r BC ) = 2r
k = 9 x 10 9 Nm 2 C −2
Akufuna: Kukula ndi komwe gulu lankhondo la Coulomb likupita
Yankho:
Mphamvu ya Coulomb pakati pa milandu A ndi B:
Chaji A ndi yabwino ndipo chaji B ndi yoipa kotero kuti komwe F AB ikupita ikulozera ku chaji A.
Mphamvu ya Coulomb pakati pa cholipiritsa B ndi cholipiritsa C:
Chaji B ndi yoipa ndipo chaji C ndi yoipa kotero kuti komwe F BC ikupita ikuloza ku chaji A.
Lamulo la mphamvu ya intaneti pa mlandu B:
F = FAB +FBC = 2 k Q2/r2 + 0.5 k Q2/r2 = 2.5 k Q2/r2 = 2.5 k Q2 r-2
Kuwongolera kwa mfundo za mphamvu kupita ku A kapena kumanzere.
