Question

When a current I is set up in a wire of radius r, the drift velocity is $v_{d}$. If the same current is set up through a wire of radius 2 r, the drift velocity will be(a) 4 $v_{d}$(b) 2 $v_{d}$(c) $\frac{v_{d}}{2}$(d) $\frac{v_{d}}{4}$

Answer 1

HERE IS YOUR ANSWER :-

Option No. A

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