MHT CET 2026 Physics question

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

(A)will not change
(B)will increase
(C)will decreaseCorrect
(D)may increase or decrease depending upon the direction of the current

Answer: (C)

Solution

Inserting an iron core increases the permeability and hence the magnetic flux linked with the solenoid (its self-inductance rises). By Lenz's law the changing flux induces an emf that opposes the increase of flux, i.e. a back emf acting against the battery emf. The net emf in the circuit therefore falls and the

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Question ID VK-100843