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The magnetic force on a charged particle moving with velocit...

The magnetic force on a charged particle moving with velocity v is

A.

proportional to both the magnitude of the charge and the velocity v

B.

independent of the magnitude of the charge

C.

proportional to the velocity v only

D.

proportional to the magnitude of the charge only

Correct answer is A

The magnetic force on a charge is given by
F = qVB Sinθ,
thus the force is proportional to both the magnitude by the charge (q) and the velocity (V)
(i/e F α qV)