If a steady magnetic field exerts a force on a moving charge, that force is directed
a) opposite the motion.
b) in the direction of the motion.
c) at right angles to the direction of the motion

C) at right angles to the direction of the motion

Explanation:

The magnetic force exerted on a charged moving particle is given by

where

q is the charge of the particle

v is the velocity of the particle

B is the magnetic field intensity

is the angle between the direction of v and B

Moreover, the direction of the force is perpendicular to both v and B. In particular, the direction can be found by using the right hand rule:

- index finger: direction of the velocity

- middle finger: direction of the magnetic field

- thumb: direction of the force (if the charge is positive, otherwise the direction must be reversed if the charge is negative)

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