Question

if two charges of 1 coulomb each are places 1km apart , then the force between them will be​

Answer 1

9×10`3N is the answer

Answer 2

Answer:

9 × 10³ N

Explanation:

The force between two charges :

Let the charges be Q1 and Q2 and the distance between them be r then the force between the charges is given by :

F = k(Q1. Q2) /r²

Where k is a constant and it is given as :

k = 9 × 10^9

From the question :

Q1 = Q2 = 1 C

r = 1 × 1000 = 1000 meters

By substitution we have :

F = 9 × 10^9 × 1/1000²

F = 9000 N

= 9 × 10³ N