CUET Preparation Today
When a charged particle moves in a uniform magnetic field, its kinetic energy: |
goes on increasing may increase or decrease depending on angle between its velocity and magnetic field remains unchanged may increase or decreased depending upon the sign of charge |
remains unchanged |
The correct answer is Option (3) → remains unchanged The force on a charged particle in a magnetic field is given by: $\vec{F} = q \vec{v} \times \vec{B}$ Since $\vec{F}$ is always perpendicular to $\vec{v}$, the magnetic force does no work on the particle: $W = \vec{F} \cdot \vec{d} = 0$ Work done = change in kinetic energy → kinetic energy remains unchanged. |
