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Question

In the adjacent figure is shown a closed path A.A long straight conductor carrying a current I passes through O and perpendicular to the plane of the paper. Then which of the following holds good ?

A
pB.dl=0
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B
pB.dl=μ0I
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C
pB.dl>μ0I
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D
None of these
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Solution

The correct option is C pB.dl=μ0I
Solution:
A long straight conductor carrying current I passes through 0 , then by
symmetry, all points of the circular path are equivalent and hence the magnitude of magentic field should be same at these points, The circulation of magnetic field along the circle is B.dl=μ0I (using Amperes law)
So,the correct option:B

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