Question

A constant current i is maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the solenoid along its axis?
(a) magnetic field at the centre
(b) magnetic flux linked with the solenoid
(c) self-inductance of the solenoid
(d) rate of Joule heating.

Answer 1

Self Inductance Increases with Permeability

Explanation:

(a) magnetic field at the center

(b) magnetic flux linked with the solenoid

(c) self-inductance of the solenoid

• Iron pole has high porousness.  
• At the point when it is embedded inside a solenoid the attractive field inside the solenoid increments.  
• As attractive field increments inside the solenoid in this manner the attractive transition additionally increments.  
• The Self-inductance (L) of the loop is straightforwardly corresponding to the permeability of the material inside the solenoid.  
• As the penetrability inside the curl increments.  

In this manner, the self-inductance will likewise increment.