A magnetic field exerts a force on a charged particle ______?

ایک مقناطیسی میدان چارج شدہ ذرہ ______ پر طاقت کا استعمال کرتا ہے؟

If the particle is at rest

If the particle moving across the field lines

If the particle moving along the field lines

None of these

A magnetic field exerts a force on a charged particle when it is moving across the field lines.

The force is zero if the particle is at rest or moving along the field lines.