Question

state qualitatively the effect of inserting an iron core into a current carrying solenoid

Answer 1

When an iron core is added to a current carrying solenoid..The magnetic field increases and hence the magnitude of current increases..
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Answer 2

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When an iron core is inserted in to a solenoid carrying current, the magnetic lines of force starts passing through the core and thus get denser. The magnetic lines of force magnetize the core and new lines of force arise from the core itself. This greatly increases the magnetic field induced inside the solenoid.

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Explanation: