In the given figure, a battery of emf E is connected across a conductor PQ 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 PQ 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 = π r 2 ρ d x ​ d V = i d R = π r 2 ipdx ​ E = d x d V ​ = π r 2 i ρ ​ and V d ​ = m e E τ ​ ∴ V d ​ × E → E ∝ r 2 1 ​ If r decreases, E will increase. ∴ V d ​ will increase.

Physics - Current Electricity Question with Solution | TestHub

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