Question

Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is

• A. Twice the magnetic field produced due to each of the wires
• B. Half of the magnetic field produced due to each of the wires
• C. Square of the magnetic field produced due to each of the wires
• D. Zero

Answer 1

Answer: (D)

Zero

At midpoint, magnetic fields due to both the wires are equal and opposite. So $B=0$.