A) \[\frac{2\pi M{{R}^{2}}}{5T}\]
B) \[U(X)=\left[ \frac{{{x}^{4}}}{4}-\frac{{{x}^{2}}}{2} \right]J\]
C) \[\sqrt{2}\]
D) \[\frac{1}{\sqrt{2}}\]
Correct Answer: B
Solution :
Intensity \[H=h+2{{h}_{1}}\] \[=h[1+2{{e}^{2}}]\] \[[\because {{h}_{1}}=h{{e}^{2}}]\] \[\text{A}\times \text{B}=\text{B}\times \text{A}\,\text{or}\,\,\left( \text{A}\times \text{B} \right)-\left( \text{B}\times \text{A} \right)=0\] \[\left( \text{A}\times \text{B} \right)+\left( \text{A}\times \text{B} \right)=0\] \[\text{2}\left( \text{A}\times \text{B} \right)=0\] \[\text{2AB sin}\theta \text{n }=\text{ }0\] \[A\ne 0\] \[\text{sin}\theta =0\]
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