Question

A current of 5A flows through each of two parallel long wires which are 2.5cm apart. Calculate the force acting per unit length​

Answer 1

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Given :  I1=I2=5 A                d=1 m

Force per unit length between them    F=2πdμoI1I2

∴  F=2π×14π×10−7×5×5=5×10−6 N/m

Since current flows in the same direction in the wires, so the wires attract each other.