A) \[\left( \frac{1}{4\pi {{\in }_{0}}} \right)\frac{Q}{{{r}^{4}}}\]
B) \[\left( \frac{1}{4\pi {{\in }_{0}}} \right)\frac{2Q}{{{r}^{4}}}\]
C) \[\left( \frac{1}{4\pi {{\in }_{0}}} \right)\frac{3Q}{{{r}^{4}}}\]
D) None of these
Correct Answer: C
Solution :
[c] \[E=\frac{1}{4\pi {{\in }_{0}}}\left[ \frac{2p}{{{\left( r-\ell /2 \right)}^{3}}}-\frac{2p}{{{\left( r+\ell /2 \right)}^{3}}} \right]\] \[=\frac{1}{4\pi {{\in }_{0}}}\frac{3Q}{{{r}^{4}}}.\]You need to login to perform this action.
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