The current flowing through solenoid coil decrease. As the iron core is inserted into the solenoid, the magnetic field and consequently the magneti flux increases. in accordance with Lenz;s law the induced current resists the increase in magnetic flux. Hence, an induced current is set up in the solenoid coil in a direction opposite to that of battery current. As a result, the current flowing in coil decreases.
Class 12 Physics Chapter 6 Electromagnetic Induction Session 2024-2025.
A solenoid is connected to a battery so that a steady current flows through it. if an iron core is inserted into the solenoid, will the current increase or decrease?
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When an iron core is inserted into a solenoid connected to a battery, the current decreases. The iron core increases the magnetic field and flux within the solenoid. According to Lenz’s law, the induced current opposes this change in magnetic flux, resisting the increase. Consequently, an induced current is set up opposite to the battery current, reducing the overall current flow in the solenoid.
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