A) 0
B) \[\frac{\sigma }{{{\in }_{0}}{{r}^{2}}}({{b}^{2}}-{{c}^{2}})\]
C) \[\frac{\sigma }{{{\in }_{0}}{{r}^{2}}}({{a}^{2}}+{{b}^{2}})\]
D) none of these
Correct Answer: B
Solution :
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