Two horizontal thin long parallel wires, separated by a distance r carry current I each in the opposite directions. The net magnetic field at a point midway between them will be
A. Zero
B. (µoI/2πr) vertically down
C. (2µoI/r) vertically upward
D. (µoI/πr) vertically down
Answer:D
Two horizontal thin long parallel wires, separated by a distance r carry current I each in the opposite directions. The net magnetic field at a point midway between them will be
A. Zero B. (µoI/2πr) vertically down C. (2µoI/r) vertically upward D. (µoI/πr) vertically down