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A long straight conductor carries current `I`. Assume that every charge carrier in it moves with the same drift velocity `v`. An observer moves parllel to the conductor, in the direction of the current, with a constant velocity `v//2`. He will observe that the current flowing in the conductor is

A

`I//2`

B

`I`

C

`3I//2`

D

Zero

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The correct Answer is:
A
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