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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
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B
L/4 H/m
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C
L/2 H/m
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D
4L H/m
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Solution

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.

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