A particle of mass $\mathrm{m}$, charge $\mathrm{Q}$ and kinetic energy $\mathrm{T}$ enters a transverse uniform magnetic field of induction $\vec{B}$. After 3 seconds the kinetic energy of the particle will be

• A

  $4 \mathrm{~T}$
• B

  $3 \mathrm{~T}$
• C

  $2 \mathrm{~T}$
• Correct answer
  D

  $\mathrm{T}$

Solution

Work done by magnetic field on charge particle is zero. Therefore its kinetic energy will be same i.e. $\mathrm{T}$

Hence, the correct answer is option: 'D'.