First slide

Motional EMF

Question

A long horizontal metallic rod with length along the east-west direction is falling under gravity. The potential difference between its two ends will

Moderate

A

Be zero
B

Be constant
C

Increase with time
D

Decrease with time

Solution

The rod is falling perpendicular to the earth's magnetic field. Therefore, $e = Bvl \Rightarrow e \propto v \propto gt$

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