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Q.

When a current flows through a conductor of cross section 10 cm2, the drift velocity of free electrons in it is 2×10−4ms−1. It is stretched uniformly such that its area of cross-section is halved and same current is made to flow through it. Now the drift velocity is

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a

2×10−4ms−1

b

10−4ms−1

c

4×10−4ms−1

d

5×10−5ms−1

answer is C.

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