Suppose we wrap a solenoid coil around a hollow cardboard cylinder. Now suppose that we insert an iron core into the solenoid. What will happen to the coil's inductance when we insert the iron core? (Explain.)
A) The inductance increases.
B) The inductance decreases.
C) The inductance is unchanged.
D) One needs more information to answer the question.

Question

Quizplus · Accepted Answer

The inductance of a coil increases when an iron core is inserted because the iron core enhances the magnetic field inside the coil. This is due to the high permeability of iron compared to air or vacuum, which allows it to concentrate magnetic lines of force and thus increase the magnetic flux linkage for the same current, leading to higher inductance.

Suppose We Wrap a Solenoid Coil Around a Hollow Cardboard