A point charge moving in a magnetic field of 1.27 Tesla experiences a force of 1

Question

A point charge moving in a magnetic field of 1.27 Tesla experiences a force of 1.463E-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 south and the force points out of the page, then give ALL possible correct answers for the charge Q (i.e., B, AC, BCD...). Q is positive, moving west Q is negative, moving east Q is negative, moving north Q is negative, moving west Q is positive, moving east

Explanation / Answer

we use the right hand rule for finding out the direction of force.

F = q V x B

F stands for force (vector)

q for charge V for velocity and B for magnetic field

put fingers of your right hand in the direction of velocity in such a allignment if you curl the fingers, you can sweep over to the magnetic field direction then the thumb points the direction of force.

magnetic field points south and force is out of the page.

so the correct options are AB

in A ) Q is positive and moving west so keep your fingers of right hand along west and curl them towards south since field points south the thumb points out of the page. hence satisfied .

if in the same case if it has been a negative charge like in D , everything is same but at the end we have to reverse the direction of force .

B ) Q is moving east so do the same procedure you will find the direction of force as into the page

since it is a negative charge we have to reverse the direction of force from into to out of page.

so the required answers are A and B

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