Self-inductance of a long solenoid is______________?

Related Mcqs:

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

   A. Decreases the resistance of the solenoid
   B. Reduces the effect of eddy current
   C. Improves the flux linkage between the turns of the coil
   D. Increases the mutual inductance between the solenoid and the core

2. 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

3. 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

4. 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

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. Self inductance of a coil depends upon________________?

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

7. 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

8. Higher the self-inductance of a coil_____________?

   A. lesser its weber-turns
   B. lower the e.m.f. induced
   C. greater the flux produced by it
   D. longer the delay in establishing steady current through it

9. 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

10. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?

    A. 20 Wb
    B. 2 Wb
    C. 0.2 Wb
    D. 0.02 Wb