A) zero
B) \[\frac{{{\mu }_{0}}}{2\pi }\frac{{{i}_{1}}{{i}_{2}}}{r}\]
C) \[{{\mu }_{0}}\frac{^{i}{{1}^{i}}2}{{{r}^{2}}}\]
D) \[\frac{^{i}{{1}^{i}}2}{r}\]
Correct Answer: B
Solution :
The force acting on unit length between two parallel current carrying conductor \[F=\frac{{{\mu }_{0}}}{2\pi }\,\frac{{{i}_{1}}{{i}_{2}}}{r}\]
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