JAMB - Physics (2005 - No. 31)
Two charged particles are projected into a region where there is a magnetic field perpendicular to their velocities. if the charges are deflected in opposite directions, which of the following statements is true of the charge?
the charge must be of opposite sign
positive charges are more in number
the charges are electrically neutral
the charges are of the same sign
Uitleg
The charge must be opposite in sign, since the positive charges will deflect to the negative plate, and the negative charge to the positive plate