There is a current of \( 40 \mathrm{~A} \) in a wire of \( 10^{-6} ...

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There is a current of \( 40 \mathrm{~A} \) in a wire of \( 10^{-6} \) square metre area of cross-section. If the number of free electrons per cubic metre is \( 10^{29} \), then the drift velocity will be
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