A) \[{{\tan }^{-1}}\left( \frac{\sigma q}{2{{\varepsilon }_{0}}mg} \right)\]
B) \[{{\tan }^{-1}}\left( \frac{\sigma q}{{{\varepsilon }_{0}}mg} \right)\]
C) \[\tan \left( \frac{2\sigma q}{{{\varepsilon }_{0}}mg} \right)\]
D) zero
Correct Answer: A
Solution :
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