4. According to Lenz's law of electromagnetic induction
a. the induced emf is not in the direction opposing the change in magnetic flux
b. the relative motion between the coil and magnet produces change in magnetic flux
c. only the magnet should be moved towards coil
d. only the coil should be moved towards magnet
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Explanation:
Lenz's law of electromagnetic induction states that, when an emf is induced according to Faraday's law, the polarity (direction) of that induced emf is such that it opposes the cause of its production.
Thus, considering Lenz's law
E=−N(
dt
dΦ
) (volts)
The negative sign shows that, the direction of the induced emf and the direction of change in magnetic fields have opposite signs.
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