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Solenoid

A solenoid ha...

Question

A solenoid having an iron core has its terminals connected across an ideal DC source and it is in steady state. If the iron core is removed, the current flowing through the solenoid just after removal of rod.

A

increases

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B

decreases

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C

remains unchanged

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D

nothing can be said

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Solution

The correct option is B decreases
On removal of iron core, the magnetic field momentasily drops resulting in a decrease in current flowing through the solenoid momentasily, but returns to original steady state after some time.
$B = μ_{0} n I ⟹ B α I$

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