Question

A magnetic field

• A. Always exerts a force on a charged particle
• B. Never exerts a force on a charged particle
• C. Exerts a force, if the charges particle is moving across the magnitude field lines
• D. Exerts a force, if the charges particle is moving along the magnitude field lines

Answer 1

The correct option is C Exerts a force, if the charges particle is moving across the magnitude field lines

The force exerted by the magnetic field is given by:

$\overrightarrow{F}=q\overrightarrow{v}\times \overrightarrow{B}$

So, the force is exerted only when the charge particle is moving across the magnetic field lines.