Q. 55.0( 1 Vote )
A constant curren
The iron rod has high permeability. So if we insert the iron rod in the solenoid along its axis, the magnetic flux inside the solenoid will increases. The self-inductance of the coil is proportional to the permeability of the material inside the solenoid. Because of an increase in the permeability inside the coil, the self-inductance will also increase. Thus, a constant current I will be maintained in the solenoid. Then
1. magnetic field at the centre
2. Magnetic flux linked with the solenoid
3. self-inductance of the solenoid is increased if an iron rod is inserted in the solenoid along its axis.
Thus, option A, B and C is the correct option.
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