Question on: WAEC Physics - 2014
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\(\mu C\)
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Correct Option: A
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
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