Question

Three points A, B, and C are located along a horizontal line, as the figure shows. A positive charge is released from rest at point A and accelerates toward point B. Upon reaching B, it continues to accelerate toward C. If only motion along the line is allowed, what would a negative charge do if it were released from rest at point B? It would remain stationary It would accelerate toward A. O It would accelerate toward C A proton and electron are simultaneously released from rest at the midpoint between the plates of a charged parallel plate capacitor. Which particle strikes one of the plates first? The electron. The proton Both particles strike a plate at the same time.

Answer 1

a)
Since the positive charge accelerate towards points B and then to C, we can conclude that both B and C are negative potential points and C is more negative than B. So, a negative charge will be accelerated in the opposite direction. So the correct answer is,
It would accelerate toward A

b)
The force on the charged particle, F = qE
Where q is the charge and E is the electric field.
Acceleration of the charged particle, a = F/m
a = qE/m
q and E are same for both electron and proton, but mass of proton is greater than that of electron.
ie, acceleration of electron is greater than that of proton.
ie, electron will reach first.