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A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of the same material but of twice the radius,what is the new mean drift velocity (a)v/4(b)v/2(c)2v(d)4v

  • physics -

    radius*2 means area*4, so v/4

  • physics -

    V/4

  • physics -

    V/2

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