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Question

Figure shows a square loop made from a uniform wire. Find the magnetic field at the center of square if a battery is connected between points A and C.


A
Zero
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B
μ0I
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C
μ0I2
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D
μ0I4
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Solution

The correct option is A Zero

From the diagram, we can see that both part A-B-C and A-D-C are of same length so both have same amount of resistance means same current I/2 will flow though them.

As result magnetic field due to A-B-C will be cancelled by A-D-C at the center because of same magnitude but opposite direction.

i.e. Bnet=0

So, option (a) is correct answer.

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