Question

A rod lies across frictionless rails in a uniform magnetic field $\overrightarrow{B}$ as shown in Fig. 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.

Answer 1

Here magnetic field is perpendicular to velocity the emf induce is (e).

e = l V B where l = length of rod,

V = velocity

and B$\to$ magnetic field to make emf (e) zero.$\overrightarrow{B}$ be zero.

$\overrightarrow{B}=0$ $\therefore$e = 0