A particle mass $m$, charge $Q$ and kinetic energy $T$ enters a transverse uniform magnetic field of…
A particle mass $m$, charge $Q$ and kinetic energy $T$ enters a transverse uniform magnetic field of induction $\overrightarrow{\mathbf{B}}$. After 3 s the kinetic energy of the particle will be
$3 T$
$2 T$
$T$
$4 T$
Solution
After passing through a magnetic field, the magnitude of its mass and velocity of the particle remain same, so its energy does not change, ie., kinetic energy will remain $T$.