MHT CET 2024 Physics question
An air cored coil has self inductance of 0.1 H. A soft iron core of relative permeability 1000 is introduced and the number of turns is reduced to . The value of self inductance is now
Answer: (C)
Solution
Self inductance of a solenoid: , so for the same geometry. With the iron core becomes 1000 times larger, and makes become of its value. Therefore $L' = 0.1
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