A) zero
B) \[\frac{{{\mu }_{0}}{{i}_{1}}{{i}_{2}}}{2\pi r}\]
C) \[\frac{2{{\mu }_{0}}{{i}_{1}}{{i}_{2}}}{\pi r}\]
D) \[\frac{2{{\mu }_{0}}{{i}_{1}}{{i}_{2}}}{{{\pi }^{2}}r}\]
Correct Answer: D
Solution :
[d] Magnetic field at the centre of the shell\[=2\frac{{{\mu }_{0}}i1}{{{\pi }^{2}}r}\] Force per unit length of the wire \[F=B{{i}_{2}}\times 1\] \[=\left[ 2\frac{{{\mu }_{0}}{{i}_{1}}{{i}_{2}}}{{{\pi }^{2}}r} \right]\]You need to login to perform this action.
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