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Lenz's Law

A square coil...

Question

A square coil ABCD is lying in xy plane with its centre at origin. A lng straight
wire passing through origin carries a current i = 2t in negative z-direction. The
induced current in the coil is

A

clockwise

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B

anticlockwise

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C

alternating

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D

zero

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Solution

The correct option is D zero
As magnetic field lines due to current carrying wire is along the surface and hence,

$ϕ = \to B . \to A = B A cos 90^{\circ} = 0$

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