Which of the following is a wrong statement?

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(B) Option $A$ is correct: Moving a conductor through a magnetic field induces an emf across its ends (motional emf).Option $B$ is incorrect: The self

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The self-induced emf produced by changing current in a coil always tends to decrease the current.

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(B) Option $A$ is correct: Moving a conductor through a magnetic field induces an emf across its ends (motional emf).Option $B$ is incorrect: The self-induced emf (back emf) opposes the change in current. If the current is increasing,it opposes the increase; if the current is decreasing,it opposes the decrease (by trying to maintain the current). Thus,it does not always tend to decrease the current.Option $C$ is correct: The self-inductance $L$ of a coil is given by $L = \frac{\mu N^2 A}{l}$. Inserting an iron core increases the permeability $\mu$,thereby increasing $L$.Option $D$ is correct: This is the standard definition of Lenz's law.

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