Question

Two infinite strips of width w m in X-direction as shown in figure, are carrying forward and return currents of $+I$ and $-I$ in the Z-direction. The strips are separated by a distance of x m. The inductance per unit length of the configuration is measured to be L H/m. If the distance of separation between the strips is now reduced to 1/2 m, the inductance per unit length of the configuration is

• A. 2L H/m
• B. L/4 H/m
• C. L/2 H/m
• D. 4L H/m

Answer 1

The correct option is C L/2 H/m

Ans : (c)

Inductance/m is proportional to separation between the strips so when separation is reduced to 1/2 then inductance will become L/2 H/m.