Question

When a charged particle moves at right angles to the magnetic field, the variable quantity is?

(a) Momentum

(b) Speed

(c) Energy

(d) Moment of inertia

The question was posed to me during an interview for a job.

This is a very interesting question from Magnetic Field in chapter Electromagnetism of Basic Electrical Engineering

Answer 1

Correct option is (a) Momentum

The explanation is: When a charged particle moves perpendicular to the field, its speed remains the same whereas its velocity keeps on changing. Momentum is the product of the mass of the particle and the velocity if the particle, hence since velocity varies, momentum also varies.