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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minPYQ_2020

PhysicsMediumsingle choice

A potentiometer wire has length $4 m$ and resistance $5Ω$ . It is connected in series with $495Ω$ resistance and a cell of e.m.f. $4 V$ . The potential gradient along the wire is

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Solution:

Total resistance $= 495 + 5 = 500Ω$ current $I = \frac{4}{500} = 8 \times 1 0^{- 3} A$ P.D. across the wire $= IR$ $= 8 \times 1 0^{- 3} \times 5 = 40 \times 1 0^{- 3} V$ $∴ Potential gradient = \frac{40 \times 1 0 ^{- 3}}{4} = 1 0^{- 2} V / m = 0.01 V / m$

Stream:MHT_CETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2020

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