Question

What must be known to determine the direction of the magnetic force on a charge? Check all that apply.

the type of the charge
the amount of the charge
the direction of the magnetic field
the velocity of the charge
the strength of the magnetic field

Answer 1

Select:
- the type of the charge (positive or negative)
- the direction of the magnetic field
- the velocity of the charge

Reason: the magnetic force is F = q(v × B). The cross product v × B sets the geometric direction; the sign of q (type of charge) determines whether F is in that direction or opposite. The force direction does not depend on the charge magnitude or the field strength.