Question

In which of the following situations, the magnetic field can accelerate a charge particle at rest?
I. When the magnetic field is uniform with respect to time as well as position
II. When the magnetic field is time varying but uniform w.r.t position
III. When the magnetic field is time independent but position dependent.

• A. I, II and II
• B. III only
• C. II only
• D. None of these

Answer 1

The correct option is D None of these

A magnetic field exerts force only on moving charges $F=BqV\sin \theta$

hence a charge at rest will never experience a force in a magnetic field.