Rank the value of ∮B→. dl→ for the closed paths shown in figure from the smallest to largest.
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a
a, b, c, d
b
a, c, d, b
c
a, d, c, b
d
a, c, b, d
answer is B.
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Detailed Solution
We shall use ∮B→. dl→ = μ0I, where I is the net current enclosed by loop.Net current enclosed by path a is zero.Net current enclosed by path c is lA.Net current enclosed by path d is 3A.Net current enclosed by path b is 5A.