A point charge moving in a magnetic field of 1.21 Tesla experiences a force of 0

Question

A point charge moving in a magnetic field of 1.21 Tesla experiences a force of 0.794·10-11 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.

1) True or False: Q is positive, moving south.
2) True or False: Q is positive, moving north.
3) True or False: Q is negative, moving south.
4) True or False: Q is negative, moving east.
5) True or False: Q is negative, moving north.

Explanation / Answer

Direction of magnetic field towards south.

Direction of moving charge is given by right hand rule

4.Q is negative, moving east. .is true only.

For Q will be positive, moving west

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