8 x \(10^{6}\)
4 x \(10^{6}\)
3 x \(10^{-4}\)
2 x \(10^{-4}\)
5 x \(10^{-7}\)
Correct answer is B
\(E= \frac{F}{O}= \frac{40}{1\times10^{-5}}=4 \times10^{6}\)
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