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Question
A soft iron bar is placed  inside a current-carrying solenoid. The magnetic field inside the solenoid will _____.
Options:
A .  decrease
B .  increase
C .  become zero
D .  remain the same
Answer: Option B
:
B
A solenoid is a long coil containing a large number of close turns of insulated copper wire. The strength of the magnetic field produced by a current carrying solenoid depends on the nature of the core material used in making it. The use of soft iron rod as the core increases the magnetic field produced by it.

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