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  4. If the radius of a copper wire carrying a current is doubled. The drift velocity of the electron will be:

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Q. If the radius of a copper wire carrying a current is doubled. The drift velocity of the electron will be:

JIPMERJIPMER 1999

Solution:

The relation for drift velocity $ i=ne{{\upsilon }_{d}}A $ From it when current is constant $ A{{\upsilon }_{d}} $ is constant when radius is doubled, area becomes four times. Hence the drift velocity become one fourth $ \left( \frac{1}{4} \right) $ .