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.

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