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(B) When an iron core is inserted into the solenoid,the permeability of the core increases,which significantly increases the self-inductance $(L)$ of

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decrease

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(B) When an iron core is inserted into the solenoid,the permeability of the core increases,which significantly increases the self-inductance $(L)$ of the solenoid.According to Lenz's law,the change in magnetic flux induces a back $emf$ $(e = -L \frac{di}{dt})$ that opposes the change in current.As the iron core is being inserted,the magnetic flux increases,causing an induced $emf$ that opposes the flow of the battery current.Consequently,the current in the solenoid decreases during the insertion process until it reaches a new steady state.

$A$ solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid,the current will

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