Q.

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

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a

4μ0i/r

b

μ0i/4r

c

μ0i/r

d

Zero

answer is C.

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Detailed Solution

At P,

Bnet=B1B2Since  B1=B2So,  Bnet=0

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Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is