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Q.

A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid


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a

will decrease

b

will remains the same

c

will increase

d

will become zero 

answer is C.

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Detailed Solution

When the soft iron bar is introduced inside the current carrying solenoid, the magnetic field inside the solenoid will increase.
The current-carrying solenoid produces its own magnetic field inside and outside its surface. When we place a soft iron bar inside the solenoid, it magnetizes the iron bar by increasing the magnetic field inside the solenoid.
 
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