Question

two equal balls having equal positive charge q coulombs are suspended by two insulating strings of equal length.what would be the effect on the force when a plastic sheet is inserted in between two?

Answer 1

The force will decrease when plastic is introduced.

This force is given as (F=Fo/k) and so it will decrease with k the dielectric constant.

Here, k will be dielectric constant for plastic which is greater than 1.

Answer 2

Answer:

The force will decrease when a plastic is inserted.

Explanation:

According to the question the balls are having equal charges, and the strings are of the same length. When these balls are suspended from the string a force will act between these charges which are equal to $\bold{\frac{F}{k}}$ where k is the dielectric constant of the material.

As plastic has been inserted between these two charges and plastic has a dielectric constant k greater than 1 and from the relation we can see that the force is inversely proportional to the dielectric constant thus the force will decrease when a plastic is inserted.