A charged particle is kept at rest on a smooth horizontal surface in uniform magnetic field 'B' which is directed vertically downward as shown in the figure.

An observer is moving with constant velocity v towards right. Then with respect to the observer which of the following statements is/are correct :

Options

A. Path of the charged particle will be straight line
B. Path of charged particle will be circular
C. Magnetic force on the charged particle is zero
D. Magnitude of magnetic force on charged particle is qVB

Answer

A, D

Explanation

The changed particle is moving in straight line at speed v w.r.t the observer in backward direction
The magnetic force on the charged particle is q Bv.