Question

Homework Questions
1. Two point charges when separated by a certain distance in air repel by a force of 100 N. When these charges are
now placed in a medium of dielectric constant 20, find the new force.​

Answer 1

Answer:

5 Newton

Explanation:

Whenever charges are placed in a medium, force decreases by its dielectric constant times.

so,

Fmedium = FORCE IN AIR

dielectric constant

= 100

20

= 5 newton

Answer 2

The new force acting on the charges is 5 N.

Explanation:

If F is force between charges when there is air between them and F' is the force when charges are placed in a medium of some dielectric constant.  When air is replaced by dielectric medium, electrostatic force decreases by factor k such that :

$F'=\dfrac{F}{k}$

Here, F = 100 N

k = 20

So,

$F'=\dfrac{100}{20}\\\\F'=5\ N$

So, the new force acting on the charges is 5 N.

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