Question

Two parallel wires separated by a distance 'd' are carrying a current 'I' in the same direction. The magnetic field along a line running parallel to these wire and midway between them

• A. Depends upon 'I'
• B. Is zero
• C. Depends upon 'd'
• D. Depends upon the permeability of medium between the wires

Answer 1

The correct option is B Is zero

Ans : (b)

Formulae for magnetic field B is given by $B=\frac{\mu (I_1-I_2)}{2\pi d}$
Here in the question, $I_1$ is equal to $I_2$ so B becomes zero.