Figure shows a rod $AB$ of length $2L$ being rotated with a constant angular velocity $\omega$, about its centre $O$ in a uniform magnetic field. If $V_{PQ}$ is the emf between any two points $P$ and $Q$ on the rod, then

An electron moves along the line $XOX\text{'}$ which lies in the same plane as the square loop of conducting wire as shown. The direction of induced current, if any in the loop is

A conducting rod $PQ$ of length $l$ placed along two smooth parallel rails is acted upon by $F.$ If $m$ is mass of rod and $V$ is the velocity of rod, then

For the LCR circuit shown, the current is observed to lead the applied voltage. To make power factor of the circuit unity, another inductor