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Questions  

A rectangular loop of sides a and b is placed in xy plane. A very long wire is also placed in xy plane such that side of length a of the loop is parallel to the wire. The distance between the wire and the nearest edge of the loop is d. The mutual inductance of this system is proportional to

a
a
b
b
c
1/d
d
current in wire

detailed solution

Correct option is A

The flux in rectangular loop due to current i in wire is Mutual inductance is M=ϕi=μ0a2πln⁡b+dd∴  Mutual inductance is proportional to a .

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