A point charge moving in a magnetic field of 1.15 Tesla experiences a force of 0

Question

A point charge moving in a magnetic field of 1.15 Tesla experiences a force of 0.754·10-11 N. The velocity of the charge is perpendicular to the magnetic field. In this problem, we use the points of the compass and `into' and `out of' to indicate directions with respect to the page. If the magnetic field points west and the force points out of the page, then select True or False for the charge Q.

Q is positive, moving south.
Q is negative, moving east.
Q is negative, moving north.
Q is negative, moving south.
Q is positive, moving north.

Label each as True or False

Explanation / Answer

False this would give a force into the page by the Right Hand Rule (RHR) False since its negative you would take velocity in the west which is parallel to B so a force of zero would result. False this would give a force into the page True True since positive a velocity in the opposite direction of above is needed to get a force in the same direction

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