Which is the answer and why? Two part question. A charged particle with unknown

Question

Which is the answer and why? Two part question.

A charged particle with unknown sign moves to the left with speed v. It enters a region with uniform electric field down and uniform magnetic field out of the page. It goes in a straight line. The gravity can be ignored. The sign of this charge must be positive. must be negative. could be either positive or negative. none of the above. Suppose the particle in Question 21 is a proton. If the speed of the proton is increased, it will still undergo no deflection. deflect out of the plane of the page. stay in the plane of the page and deflect upward. stay in the plane of the page and deflect downward.

Explanation / Answer

21. Charge on particle could be positive or negative. As the sign of charge changes, then direction of forces due to electric and magnetic also interchange, so the net force remain zero, (i.e. no effect of sign of charge).

22. The proton will " Stay in the plane of the page and deflect upward" option c as the velocity increases the magnitude of magnetic force also increases. Since the magnetic force acts upward (From Maxwell's right hand thumb rule), so part will deflect upward.

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