Question

Two long, straight, parallel wires 24 cm apart carry currents of I1 = 30A andI2 = 20A in the same direction. Determine the magnetic field in the plane of the twowires at a point halfway between the wires.

Answer 1

Induction of the direct wire field B = μ₀I/2πr, in accordance with the principle of superposition B_h = μ₀ (I₁ - I₂)/πl = 4*10^-7*10/ 0.24 = 16.7 (mT).

So, B = 16.7 mT.