Mafunso atatu okhudza Potential difference equation
1. Mphamvu yamagetsi imasunthidwa mu gawo lamagetsi lofanana ndi mphamvu ya 2√3 N mtunda wa 20 cm. Ngati mphamvuyo ili pa ngodya ya 30 o kupita ku kusuntha kwa mphamvu yamagetsi, kodi kusiyana kwake ndi kotani pakati pa mphamvu yamagetsi yomwe imapezeka poyamba komanso kumapeto kwa mphamvu yamagetsi.
Zodziwika:
Mphamvu (F) = 2√3 N
Mtunda (ma) = 20 cm = 0.2 m
Ngodya (θ) = 30 o
Kufunidwa: Kusiyana kwa mphamvu yamagetsi
yankho;
Ntchito yosamutsa mphamvu +q kuchokera ku a kupita ku b ndi yofanana ndi kusiyana kwa mphamvu yamagetsi pa mfundo a ndi b.
ΔEP = ΔW
Ngati njira ya mphamvu F yokhudzana ndi njira yotumizira mphamvu +q ili yopingasa θ, ndiye kuti ntchito yotumizira mphamvu +q kuchokera ku a kupita ku b ndi:
ΔW = F Δs cos θ = ( 2 √ 3 ) (0,2)(cos 30) = (0,4 √ 3 ) (0,5 √ 3 ) = (0,2) (3) = 0,6 Joule
2. Ngati mphamvu ndi mphamvu ya ma capacitor zimadziwika kuti ndi 5 µC ndi 20 µF, motsatana, dziwani kusiyana komwe kulipo pakati pa ma capacitor.
Zodziwika:
Mphamvu yamagetsi (q) = 5 µC = 5 x 10 -6 C
Kuchuluka kwa capacitor (C) = 20 µF = 20 x 10 -6 F
Kufunidwa: Kusiyana kwa mphamvu ya capacitor (V)
yankho;
Fomula ya kusiyana kwa mphamvu ya capacitor, mphamvu ya capacitor ndi chaji:
V = q / C = (5 x 10 -6 ) / 20 x 10 -6 = 5/20 = 0,25 Volts
3. Ma point charge awiri QA = -4 µC ndipo QB = 8 µC ali mtunda wa masentimita 16. Dziwani mphamvu yamagetsi pakati pa ma charge awiriwa.
Zodziwika:
Chaji yamagetsi 1 (Q A ) = 4 x 10 -6 C
Chaji yamagetsi 2 (Q B ) = 8 x 10 -6 C
Mtunda (r) = 8 cm = 0,08 m
Coulomb yosasintha (k) = 9 × 10 9 Nm 2 /C 2
Kufunidwa: Mphamvu yamagetsi pa C (V C )
yankho;
V A = k Q / r = (9 × 10 9 )(4 x 10 -6 ) / 0,08 = (36 × 10 3 ) / 0,08 = -450 Volts
V B = k Q / r = (9 × 10 9 )(8 x 10 -6 ) / 0,08 = (72 × 10 3 ) / 0,08 = 900 Volts
Mphamvu yamagetsi pa C (V C ) = 900 – 450 = 450 Volts
