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Q.

A long horizontal rigidly supported wire carries a current ia=96A. Directly above it and parallel to it at a distance, another wire of 0.144N weight per metre carrying a current ib=24A, in a direction opposite to that of ia. If the upper wire is to float in air due to magnetic repulsion, then its distance (in mm) from the lower wire is

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a

4.8

b

1.6

c

3.2

d

9.6

answer is C.

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Detailed Solution

Mgl=μ0i1i22πr;0.144=4π×10−7×24×962π×r
r = 3.2mm

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