A point charge moving in a magnetic field of 1.30 Tesla experiences a force of 0

Question

A point charge moving in a magnetic field of 1.30 Tesla experiences a force of 0.853E-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 give all possible correct answers for the charge Q. (Give all correct statments in alphabetical order: ACD, BE, etc.)


A) Q is positive, moving north
B) Q is positive, moving south
C) Q is negative, moving north
D) Q is negative, moving east
E) Q is negative, moving south

Explanation / Answer

For positive charges, use the right hand rule. Point the 4 fingers in the direction of the velocity, and curl ( bend ) fingers towards mag field. The thumb points to force. The only way to hold you hand with the thumb OUT of page, and fingers bending WEST is to have the four fingers pointing NORTH. So A) is a correct answer. For negative charges, we use the same rule, but with left hand. Therefore, the only way to have thumb OUT and fingers bend WEST is to point four fingers DOWN. So E) is correct. D) will never work because it is parallel to mag field, but force only exists if velocity is perpendicular. The fore, the answers, in alphabetical order, are A and E

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