question_answer

A long wire A carries a current of 10 amp. Another long wire B, Which is parallel to A and separated by 0.1m from A, carries a current of 5 amp, in the opposite direction to that in A. what is the magnitude and nature of the force experienced per unit length of B  \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}\,weber/amp\text{-}m)\]                              [MP PET 2000]

A)            Repulsive force of \[{{10}^{-4}}N/m\]

B)            Attractive force of \[{{10}^{-4}}N/m\]

C)            Repulsive force of \[2\pi \times {{10}^{-5}}N/m\]

D)            Attractive force of \[2\pi \times {{10}^{-5}}N/m\]