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Motional EMF

A metal rod m...

Question

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant uniform magnetic field exists in space in a direction perpendicular to the rod as well its velocity. Select correct statements (s) from the following

A

the entire rod is at the same potential

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B

there is an electric field in the rod

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C

the electric potential is highest at the centre

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D

the electric potential is lowest at its centre and increases towards its ends

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Solution

The correct option is D there is an electric field in the rod
The moving rod develops an electric field = Bvl
and the EMF induced is such that it opposes the change of magnetic field.
Due to shifting of electrons, one end of the rod becomes positive and the other end negative. This developes a electric field in the rod.

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