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Two very long, straight, parallel conductors A and B carry current of 5 A and 10 A respectively and are at a distance of 10 cm from each other. The direction of current in two conductors is same. The force acting per unit length between two conductors is: ($\mu_0=4\pi\times10^{-7}$ SI unit)
Detailed Solution
Parallel currents in the same direction attract. $\frac{F}{l}=\frac{\mu_0 i_1 i_2}{2\pi d}=\frac{2\times10^{-7}\times5\times10}{10\times10^{-2}}=10^{-4}$ N/m.