A magnetic field cannot

Question

A magnetic field cannot (A) change the velocity of a charged particle (B) change the momentum of a charged particle (C) change the kinetic energy of a charged particle (D) change the trajectory of a charged particle

Tardigrade Admin · Accepted Answer

A magnetic field cannot change the kinetic energy of a charged particle, because charge particle moves on circular path in magnetic field, in which magnitude of velocity remains constant
Hence,

K = \frac{1}{2} m v^{2}

= constant

Q. A magnetic field cannot

change the velocity of a charged particle

change the momentum of a charged particle

change the kinetic energy of a charged particle

change the trajectory of a charged particle

A magnetic field cannot change the kinetic energy of a charged particle, because charge particle moves on circular path in magnetic field, in which magnitude of velocity remains constant Hence, K=21​mv2 = constant

A magnetic field cannot change the kinetic energy of a charged particle, because charge particle moves on circular path in magnetic field, in which magnitude of velocity remains constant
Hence, $K = \frac{1}{2} m v^{2}$ = constant