1) Consider a metal ball of radius r moving at a constant velocity v in a uniform magnetic field of induction $\overline{B}$, Assuming that the direction of velocity forms an angle $\alpha$ with the direction of $\overline{B}$, the maximum potential difference between points on the ball is A) $r|\overline{B}||\overline{V}|\sin \alpha$ B) $|\overline{B}||\overline{V}|\sin \alpha$ C) $2r|\overline{B}||\overline{V}|\sin \alpha$ D) $2r|\overline{B}||\overline{V}|\cos \alpha$ Answer: Option CExplanation: Given , The radius of metal ball=r Velocity =v Angle between direction of velocity and magnetic field (B)= $\alpha$ We know that, $e= Bl v \sin \alpha$ Here, l=2r, $e=2r|B||v| \sin \alpha$
