Question

A charged particle is moving through uniform magnetic field, then in which case will magnetic field exert force on charged particle ?

• A. Always exerts a force on the particle
• B. Never exerts a force on the particle.
• C. Exerts a force, if the particle is moving along the field.
• D. Exerts a force, if the particle is moving perpendicular to the direction of the field.

Answer 1

The correct option is D Exerts a force, if the particle is moving perpendicular to the direction of the field.

Answer is D.

A charged particle moving through uniform magnetic field, experiences a force due to magnetic field and moves perpendicular to the direction of magnetic field.
The expression is given as,
$F=qV\times B$
where,
$F-$ Magnetic force
$q-$ charge
$V-$ Velocity of the moving charge
$B-$ Magnetic field
The force exerted is always perpendicular to the plane formed by $V$ and $B$. Oppositely directed forces exerted on oppositely charged particles will cause the particles to move in opposite directions. Therefore, option D is the answer.