Question

An electron e and a proton p are simultaneously released from rest in a uniform electric field E, as shown. Assume that the particles are sufficiently far apart so that the only force acting on each particle after it is released is that due to the electric field. At a later time when the particles are still in the field, the electron and the proton will have the same

(A) direction of motion

(B) speed

(C) displacement

(D) magnitude of acceleration

(E) magnitude of force acting on them

Answer 1

The correct option is: (E) magnitude of force acting on them

Explanation:

Not a magnetism question, but lets review. Since the charge magnitude is the same, they will experience the same forces based on F_e = Eq, but move in opposite directions. Since the masses are different, the same forces will affect each object differently so that the smaller mass electron accelerates more, thus gains more speed and covers more distance in equal time periods. So only the force is the same.