Two wires of same material but if different diametercarry the same current i if the ratio of their diameter is 2:1
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Drift velocity vd=InAe=I×4nπD2e
ie, vd∝1D2
∴ Vd1Vd2=D²2/D²1=(12)2=1/4
hence 1:4
here the answer..
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