Home
Class 12
PHYSICS
If a rate of change of current of 4 As^(...

If a rate of change of current of 4 `As^(-1)` induces an emf of 20 mV in a solenoid, the self inductance of the solenoid is

A

3 mH

B

4 mH

C

5 mH

D

6 mH

Text Solution

Verified by Experts

The correct Answer is:
C
`e=L(dI)/(dt)`
`20xx10^(-3)=Lxx4`
`therefore L=mH`
Promotional Banner

Topper's Solved these Questions

  • ELASTICITY

    NIKITA PUBLICATION|Exercise MCQ|314 Videos

  • ELECTRONS AND PHOTONS

    NIKITA PUBLICATION|Exercise MCQs|162 Videos

Similar Questions

Explore conceptually related problems

Self induction of a solenoid is

Self-inductance of a solenoid depend on-

Induced emf and self inductance

Write an expression for self inductance of a long solenoid.

What is meant by self-inductance of a coil? Obtain an expression for the self-inductance of a long solenoid.

If a current of 10 A changes in one second throught a coil, and the induced emf is 10 V, then the self-inductance of the coil is

An e.m.f of 40 mV is induced in a solenoid, when the current in it changes at the rate of 2 A//s . The self inductance of the solenoid is

Two solenoids are part of the spark coil of an automobile. When the current in one solenoid fails from 6.0 A to zero in 2.5 ms, an emf of 31 kV is induced in the other solenoid. What is the mutual inductance M of the solenoids?

The diagram given below shows a solenoid carrying time varying current l= l_(0)t . On the axis of the solenoid, a ring has been placed. The mutual inductance of the ring and the solenoid is M and the self inductance of the ring is L. If the resistance of the ring is R then maximum current which can flow through the ring is

NIKITA PUBLICATION-ELECTROMAGNETIC INDUCTION-MCQs
  1. In an AC circuit, the current is given by i=5sin(100t-(pi)/2) and the ...

    Text Solution

    |

  2. A straight conductor of length 0.4 m is moved with a speed of 7 m/s pe...

    Text Solution

    |

  3. If a rate of change of current of 4 As^(-1) induces an emf of 20 mV in...

    Text Solution

    |

  4. When the number of turns and the length of the solenoid are doubled ke...

    Text Solution

    |

  5. A coil having effective area A, is held with its plane normal to a mag...

    Text Solution

    |

  6. The dimensions of magnetic flux are

    Text Solution

    |

  7. Which graph gives the correct relation between Z and f for the given R...

    Text Solution

    |

  8. In the given L-R circuit, which of the following gives correct relatio...

    Text Solution

    |

  9. Reactance of a capacitor of capacitance CmuF for ac frequency 400/pi H...

    Text Solution

    |

  10. In a coil, L=5H, current changes at the rate of 2 ampere per second. ...

    Text Solution

    |

  11. An alternating e.m.f. given by e=200 sin 50 t is applied to a circuit ...

    Text Solution

    |

  12. Flux passes through coil changes from 2xx10^(-3)Wb to 3xx10^(-3) Wb du...

    Text Solution

    |

  13. A conductor of length 10 cm is moved parallel to itself with a speed o...

    Text Solution

    |

  14. In an AC circuit containing only capacitance the current

    Text Solution

    |

  15. Wattless current is obtained

    Text Solution

    |

  16. For a coil of unit area, induction B is doubled in 0.2s. Then, the ind...

    Text Solution

    |

  17. Deal beat galvanometer works on the principle of

    Text Solution

    |

  18. The capacitive reactance is 20Omega, when the frequency is 100 Hz. Fin...

    Text Solution

    |

  19. In a series resonant L-C-R circuit, the power factor is

    Text Solution

    |

  20. A half metre rod is rotating abou tone fixed end perpendicular to unif...

    Text Solution

    |