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Solution


Q.

The magnetic field strength of a solenoid can be increased by inserting:
1 a wooden piece into it.  
2 an iron piece into it.  
3 a glass piece into it.  
4 paper roll into it.  

Ans.

(2)

When a piece of soft iron is inserted inside a solenoid, then the strength of the magnetic field increases because the iron gets magnetized due to magnetic induction. This combination of the solenoid and the soft iron core so formed is called an electromagnet.