At which angle must a charged particle be moving to experience no magnetic force?

A. 180° to the magnetic field

B. 145° to the magnetic field

C. 45° to the magnetic field

D. 90° to the magnetic field

The correct option is (A) i. e. 180° to the magnetic field.

Explanation:

The magnetic force on a charged particle is given as: F = qvBsinФ

B is the magnetic field.

q is the charge on the particle.

v is the velocity of the charged particle.

Ф is the angle between magnetic field (B) & the velocity of charge (v).

⇒ F = qvb sin Ф

When Ф = 180,

& sin Ф = 0

⇒ F = 0

therefore, there is no magnetic force when the magnetic field is parallel or anti-parallel to the velocity of the particle.