Question

why iron core is uesd in a solenoid.... ????
what if we will not put iron as core material and only turn the wire into loops ????​

Answer 1

Answer:

By placing a core inside of a coil the strength of the magnetic field can be increased. By putting a ferrous (iron) core inside a solenoid, the field lines are concentrated. This has the effect of strengthening the field.

Explanation:

Answer 2

By placing an iron core inside the solenoid the strength of the magnetic field increases. It has been found that if a soft iron rod called core is placed inside a solenoid, then the strength of the magnetic field becomes very large because the ironore is magnetized by induction.