Question

3. A force of 40 N is acting between
two charges in air if the space
between them is filled with glass er =
8. Then the force between them
isகாற்றில் இரண்டு மின்
சுமைகளுக்கு இடையில்
செயல்படும் விசை 4ON,​

Answer 1

Hope you understood

All the best

Answer 2

Given:

• Force between charges in air = 40 N.
• e_(r) = 8

To find:

• Force between the charges in glass ?

Calculation:

• e_(r) actually refers to the dielectric constant of of glass that was filled in between the two charges.

Now, in air :

$F_{air} = \dfrac{k(q1)(q2)}{ {r}^{2} }$

Now, in glass :

$F_{glass} = \dfrac{k(q1)(q2)}{ e_{r} \times {r}^{2} }$

$\implies F_{glass} = \dfrac{1}{ e_{r}} \times \dfrac{k(q1)(q2)}{ {r}^{2} }$

$\implies F_{glass} = \dfrac{1}{ e_{r}} \times F_{air}$

• Now, putting the values :

$\implies F_{glass} = \dfrac{1}{8} \times 40$

$\implies F_{glass} = 5 \: N$

So, electrostatic force between the charges in glass will be 5 Newton.