Question

A particle of mass m, charge q and kinetic energy K enters perpendicular to a uniform magnetic field of magnitude B. After 3 seconds the kinetic energy of
the particle will be:
Options
3K
2K
4K
K​

Answer 1

after passing through a magnetic field, the magnitude of its mass and velocity of the particle remains same, so its energy does not change that is kinetic energy will remain T.

Hence (C) is correct answer

ur ans is K