Question

In case of a charged particle moving in a non-
uniform magnetic field (independent of time)
(1) Speed changes
(2) Kinetic energy changes
(3) Work is non zero
(4) Momentum changes​

Answer 1

The magnetic force exerted will be perpendicular to the direction of motion of the proton. As we know when when force acting is perpendicular to the direction of moving charge, work done will be zero. It means kinetic energy does not change. The force is able to change the direction (velocity) of the proton but not its speed (magnitude). Thus momentum and velocity changes.

hope it is helpfull to you