A) \[1\,N/m\]
B) \[2\times {{10}^{-7}}\,N/m\]
C) \[1\times {{10}^{-2}}\,N/m\]
D) \[4\pi \times {{10}^{-7}}\,N/m\]
Correct Answer: B
Solution :
Force per unit length on two parallel current carrying conductor is given by \[\frac{F}{l}={{10}^{-7}}\times 2\frac{{{i}_{1}}{{i}_{2}}}{a}\] Þ \[\frac{F}{l}={{10}^{-7}}\times 2\times \frac{1\times 1}{1}=2\times {{10}^{-7}}\,N/m\]
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