Question

Two equally charged pith balls 3cm apart repel
each other with a force of 4x10^-5 newton. The
charge on each ball is
1)2×10^9C 2) 2x10^-9c 3)2/3×10^9C 4) 2/3×10^-9C​

Answer 1

Answer:

Answer (b) 2×10−9C

Explanation:

The pith balls repel each other with force F=4×10

−5

N and let the charge on each pith ball be Q.

∴

(3×10

−2

)

2

k(Q)(Q)

=4×10

−5

or, Q

2

=

9×10

9

4×10

−5

×9×10

−4

or, Q

2

=4×10

−18

or, Q=2×10

−9

C