Question

An electron 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 electron after its release? Assume the only force on the electron is from the large positive charge.

• A. I only
• B. II only
• C. III only
• D. None of the above

Answer 1

Answer: (C)

III only

Under the electric force between electron and positive charge, electrons attracts and move towards the positive charge. Hence, with time, the force and thus the acceleration of electron increases.

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

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