The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?

Related Mcqs:

1. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?

   A. 3 mH
   B. 12 mH
   C. 24mH
   D. 48mH

2. Self-inductance of a long solenoid is______________?

   A. μoN2A
   B. μoN2/A
   C. μoN2
   D. BA

3. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?

   A. increase
   B. decrease
   C. remain the same
   D. initially increase and then decrease

4. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

   A. 6 H
   B. 8 H
   C. 12 H
   D. 24 H

5. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

   A. 6 mH
   B. 14 mH
   C. 24 mH
   D. 48 mH

6. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?

   A. unaffected
   B. doubled
   C. halved
   D. quadrupled

7. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?

   A. variation in coil current
   B. variation in voltage to the coil
   C. change of number of turns of coil
   D. the resistance of magnetic path

8. Self inductance of a coil depends upon________________?

   A. current flowing
   B. number of turns per unit length
   C. voltage produce
   D. all

9. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?

   A. 4 mH
   B. 5 mH
   C. 6 mH
   D. 12 mH

10. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns

    A. Yes
    B. No