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Two identical charges situated 20cm apart in vacuum repel ea...

Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 πεo)1 = 9 x 109Nm2C-2]

A.

21μC

B.

3.6μC

C.

4.0μC

D.

4.4μC

Correct answer is A

F = Q24πεor2

I = 9 x 109 x Q20.22

Q = 0.049×109

= 2.11 x 10-6