Two identical charges situated 20cm apart in vacuum repel each other with a force of...

WAEC 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 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

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Two identical charges situated 20cm apart in vacuum repel each other with a force of...

Correct Answer: Option A

Explanation

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