In the given figure, a battery of emf E is connected across a conductor P Q of length l and different area of cross-sections having radii r 1 and r 2 r 2

Question

In the given figure, a battery of emf E is connected across a conductor P Q of length l and different area of cross-sections having radii r 1 and r 2 r 2 < r 1 . Choose the correct option as one moves from P to Q .

TestHub · Accepted Answer

Current is constant in conductor i = constant Resistance of element d R = ρ d x π r 2 d V = i d R = ipdx π r 2 E = d V d x = i ρ π r 2 and V d = e E τ m ∴ V d × E → E ∝ 1 r 2 If r decreases, E will increase. ∴ V d will increase.

Physics - Current Electricity Question with Solution | TestHub

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