A) \[4\sqrt{5}\times {{10}^{-5}}T\]
B) \[2\sqrt{5}\times {{10}^{-5}}T\]
C) \[4\sqrt{5}\times {{10}^{-7}}T\]
D) \[2\sqrt{5}\times {{10}^{-7}}T\]
E) \[4\sqrt{2}\times {{10}^{-7}}T\]
Correct Answer: D
Solution :
\[R=\sqrt{{{P}^{2}}+{{Q}^{2}}}\] \[B={{\left\{ {{\left[ \frac{2p}{{{\left( \frac{d}{2} \right)}^{3}}} \right]}^{2}}+{{\left[ \frac{p}{{{\left( \frac{d}{2} \right)}^{3}}} \right]}^{2}} \right\}}^{1/2}}\times {{10}^{-7}}\] \[=\sqrt{({{4}^{2}}+4)}\times {{10}^{-7}}\] \[=\sqrt{20}\times {{10}^{-7}}=2\sqrt{5}\times {{10}^{-7}}T\]You need to login to perform this action.
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