Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityEquivalent ResistanceMedium2 minPYQ_2023

PhysicsMediumsingle choice

A $10 m$ long wire of resistance $20Ω$ is connected in series with a battery of e.m.f. $3 V$ (negligible internal resistance) and a resistance of $10Ω$ . The potential gradient along the wire is

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Solution:

Two resistances are in series $R_{net} = 20Ω + 10Ω = 30Ω$ Current $I = \frac{3}{30} = 0.1 A$ Potential through the wire is $V = 0.1 \times 20 = 2 V$ $∴$ Potential gradient $= \frac{V}{10} = \frac{2}{10} = 0.2 \frac{V}{m}$

Stream:MHT_CETSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2023

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