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The coefficient of self inductance of a solenoid is 0.18 mH. If a core of soft iron of relative permeability 900 is inserted, then the coefficient of self inductance will become nearly,
 

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Important Questions on Electromagnetic Induction

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 204
The coefficient of mutual induction between two coils is 4 H. If the current in the primary reduces from 5 A to zero in 10-3 s, then the induced e.m.f. in the secondary coil will be,
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 205
Choke coil works on the principle of 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 206
The unit of inductance is
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 207
An e.m.f. of 5 V is produced by a self-inductance when the current changes at a steady rate from 3 A to 2 A in 1 millisecond. The value of self inductance is 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 208
A varying current in a coil changes from 10 A to zero in 0.5 s. If the average e.m.f induced in the coil is 220 V, then the self-inductance of the coil is
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 209
In a coil, L=5 H current changes at the rate of 2 A per second. The e.m.f. induced 
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 210
The inductance of a closed-packed coil of 400 turns is 8 mH. A current of 5 mA is passed through it. The magnetic flux through each turn of the coil is 
 
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 211
A long solenoid has 500 turns. When a current of 2 A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4×10-3Wb. The self-inductance of the solenoid is