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 (pi varepsilon_o)^{-1}) = 9 x 109Nm2C-2]
-
A.
21(mu C) -
B.
3.6(mu C) -
C.
4.0(mu C) -
D.
4.4(mu C)
Correct Answer: Option A
Explanation
F = (frac{Q^2}{4 pi varepsilon_o r^2})
I = 9 x 109 x (frac{Q^2}{0.2^2})
Q = (sqrt{frac{0.04}{9 times 10^9}})
= 2.11 x 10-6