Question

A proton is released from rest in an area where it is in the electric field of solid conducting sphere that has a large net positive charge. Which graph would best represent the movement of the proton after its release? Assume the only force on the proton is from the large positive charge.

• A. I only
• B. II only
• C. III only
• D. II and III only

Answer 1

The correct option is A I only

Under the electric force between proton and positive charge, protons repel and move away from the positive charge. Hence, with time, the force and thus the acceleration of proton decreases.

$a=\frac{dv}{dt}$

Hence the slope of the v-t decreases in time.

Correct answer is option A..