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Question

Assertion : If a current flows through a wire of non-uniform cross-section, potential difference per unit length of the wire in the direction of current is same at different points.
Reason : V = iR and current in the wire is same throughout.

A
Both (A) and (R) are true and (R) is the correct explanation of A
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B
Both (A) and (R) are true but (R) is not the correct explanation of A.
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C
(A) is true but (R) is false
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D
(A) is false but (R) is true
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Solution

The correct option is C (A) is false but (R) is true
Current through the wire at every point is same. But the wire is of non-uniform cross section . The value of R is not same for every infinitesimal element P.D. across the infinitesimal length is not same for the entire wire.

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