Question

A small styrofoam ball with a layer of metallic coating is lowered into the gap between two large metal plates. A large potential difference V is kept between the two plates. What will be the motion of the Styrofoam ball

Answer 1

Answer:

ball will oscillate in between the plates

Explanation:

The metallic coated styrofoam lowered in between two large metal plates, a large potential difference V is kept between the two plates, will experience a force of repulsion ( because both plates and balls will have similar kind of charges and like charges repel each other)  from the opposite plates.

If we consider d as the distance between the plates, E as electric field because of Potential difference V. Then force F experience by the ball will be

$F= \frac{qV}{d}$

where q be the total charge on the metallic coated ball.

clearly,  since, both the plates will repel the ball in opposite directions, hence ball will be in oscillate in between the plates.