A particle of mass m and charge q enters a region of magnetic field (as shown)
Channel: Doubtnut
Date: 2021-11-02

A particle of mass m and charge q enters a region of magnetic field (as shown) with speed v at t = 0. There is a region in which the magnetic field is absent as shown. The particle after entering the region collide elastically with a rigid wall. Time t after which the velocity of particle become antiparallel to its initial velocity is - img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/CP_JM_MT_02_E01_003_Q01.png" width="80%"