Two long parallel wires kept 2 m apart carry 3A current each, in the same direction. The force per unit length on one wire due to the other is ______.

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Two long parallel wires kept 2 m apart carry 3A current each, in the same direction. The force per unit length on one wire due to the other is 9 $\times$ 10-7 N/m, attractive. Explanation: Given I1 = I2 = 3 A, d = 2 m, the current is flowing in the same direction, Now, F/l = (mu_0I_1I_2)/(2pid) = `(4pi xx 10^-7 xx 3 xx 3)/(2pi xx 2) = 9 $\times$ 10-7 N/m F/l = 9 xx 10^-7` N/m

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