20-1MAGNETICFIELD ANDMAGNETICFORCES20Answers to Multiple-Choice Problems1.E2.C3.C4.B5.D6.A7.C8.C9.B10.A11.C12.B13.A14.B15.ASolutions to Problems20.1.Set Up:The force on the particle is in the direction of the deflection of the particle. The directions of and are shown in Figure 20.1. Apply the right-hand rule to the directions of and See if your thumb is in thedirection of or opposite to that direction. Use with to calculate F.Figure 20.1Solve: (a)When you apply the right-hand rule to and your thumb points east. is in this direction, so the chargeis positive.(b)20.2.Set Up:The force
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