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Solution


Q.

The strength of an electromagnet after the limit cannot be increased by increasing the current through the solenoid. What is the reason behind this phenomenon
1 Electrons start to corrode the solenoid.  
2 Voltage through the solenoid gradually starts to decrease.  
3 Resistance of the solenoid increases.  
4 Current flowing through the solenoid is saturated.  

Ans.

(4)

The strength of an electromagnet after the limit cannot be increased by increasing the current through the solenoid because current flowing through the solenoid is saturated.