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 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
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Important:
Iron core changes magnetic field, not current in DC steady state
Updated On: May 8, 2026
- will not change.
- will increase.
- will decrease.
- may increase or decrease depending upon the direction of the current.
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
• Current in a DC circuit is given by Ohm’s law: $I = \frac{V}{R}$
• Resistance of the coil does not change on inserting iron core
Step 1: Effect of iron core.
Iron core increases magnetic field (permeability), not resistance.
Step 2: Steady current condition.
Battery provides constant voltage → resistance unchanged → current unchanged.
Step 3: Conclusion.
Current remains same. Final Answer: Option (A)
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