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A rod lies across frictionless rails in ...

A rod lies across frictionless rails in a uniform magnetic field `vec(B)` as shown in figure. The rod moves to the right with speed `V`. In order to make the induced emf in the circuit to be zero, the magnitude of the magnetic field should

A

(a) not change

B

(b) increase linearly with time

C

( c) decrease linearly with time

D

(d) decrease nonlinearly with time

Text Solution

Verified by Experts

The correct Answer is:
D
(d) `Bl Vt = constant`
`B = ( C)/(lVt)`
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