Lenz's law and conservation of energy
Question
A square coil ABCD is lying in an x-y plane with its centre at origin. A long straight wire passing through origin carries a current i = 2t in negative z-direction. The induced current in the coil is
Moderate
Solution
Magnetic lines are tangential to the coil as shown in figure. Thus, the net magnetic flux passing through the coil is always zero or the induced current will be zero.
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