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A solenoid is connected to a battery so ...

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

A

The current will not change

B

The current will increase

C

the current will decrease

D

the flux through the coil will decrease.

Text Solution

Verified by Experts

The correct Answer is:
C
When the iron core is inserted in the current carrying solenoid, the magnetic field increase due to the magnetisation of irotn core and consequently the flux increases.
According to Lenz's law, the emf produced must oppose this increases in flux, which can be done by making decreases in current. So, the current will decrease.
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Knowledge Check

  • A solenoid is connedted to a source of constant EMF for a long time. A sof iron piece is inserted into it. Then :

    A
    Self-inductance of the solenoid gets increased
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    D
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    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
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  • Statement I: An eletric lamp is connected in series with a long solenoid of copper with air core and then connected to an ac source. If an iron rod is inserted in the solenoid, the lamp will become dim. Satement II: If an iron rod is inserted in the solenoid, the inductance of the solenoid increases.

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    B
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    D
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