NDA 2023 Physics question

In an electric circuit, a wire of resistance 10 Ω is used. If this wire is stretched to a length double of its original value, the current in the circuit would become :

(A)half of its original value.
(B)double of its original value.
(C)one-fourth of its original value.Correct
(D)four times of its original value.

Answer: (C)

Solution

On stretching, the volume stays constant, so when the length doubles the cross-sectional area halves.

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Question ID VK-032418