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 0.749E-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 (i.e., B, AC, BCD...).

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

Explanation / Answer

F = q(vxB)

k = Q(v x -i)

if Q is positive, v is along j direction i.e moving north

if Q is negative ,v is along -j direction,i.t moving south

correct options are (D) (E)

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