A) zero
B) \[\frac{{{\mu }_{0}}}{\pi a}\]
C) \[\frac{2{{\mu }_{0}}}{\pi a}\]
D) \[\frac{4{{\mu }_{0}}i}{\pi a}\]
Correct Answer: A
Solution :
Resultant intensity at centre \[B={{B}_{1}}+{{B}_{2}}+{{B}_{3}}+{{B}_{4}}\] \[B=\frac{{{\mu }_{0}}}{4\pi }\frac{2I}{a/2}+\frac{{{\mu }_{0}}}{4\pi }\,\frac{2I}{a/2}-\frac{{{\mu }_{0}}}{4\pi }\frac{2I}{a/2}-\frac{{{\mu }_{0}}}{4\pi }\frac{2I}{a/2}\] \[B=0\]You need to login to perform this action.
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