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The two ends of a horizontal conducting ...

The two ends of a horizontal conducting rod of length `l` are joined to a voltmeter. The whole arrangement moves with a horizontal velocity `v` , the direction of motion being perpendicular to the rod. The vertical component of the earth's magnetic field is `B` . The voltmeter reading is

A

`Blv` only if the rod moves eastward

B

`Blv` only if the rod moves westward

C

`Blv` if the rod moves in ,any direction

D

zero

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The correct Answer is:
D
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