Home
Class 12
PHYSICS
When electric current in a coil steadily...

When electric current in a coil steadily changes from +2 A to -2 A is 0.05 s, an induced emf of 0.8 V is generated in it. Then the self Inductance of the coil is ....... H.

A

0.2

B

0.4

C

0.8

D

0.1

Text Solution

Verified by Experts

The correct Answer is:
D
`epsilon=-L (dI)/(dt)`
`therefore 8=(-L xx (-4))/0.05`
`therefore L=(8xx0.05)/4` = 0.1 H
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    KUMAR PRAKASHAN|Exercise Section D MCQs (From DARPAN Based on Textbook )|121 Videos

  • ELECTRIC CHARGES AND FIELDS

    KUMAR PRAKASHAN|Exercise SECTION D MCQS ASKED IN COMPETITIVE EXAMES (MCQS AKSED IN BOARD EXAM AND GUJCET)|14 Videos

  • ELECTROMAGNETIC WAVES

    KUMAR PRAKASHAN|Exercise BOARD.S QUESTION PAPER MARCH - 2020 (PART - B) SECTION - C|5 Videos

Similar Questions

Explore conceptually related problems

Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, give an estimate of the self-inductance of the circuit.

For one coil, kept in 1T external magnetic field, current passing through it increases from 1 A to 2 A in 2 xx 10^(-3) s. Meanwhile time rate of change of its area is found to be 5 "m"^2/"ms" . Then the self inductance of the coil is ____

Mutual inductance of system of two coils is 0.3 H. If the current in the one coil is changed from 10A to 40A in 0.01 sec, the average induced emf in the other coil is ...... volt.

A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil ?

Magnetic flux of 10 mu Wb is linked with a coil, when a current of 2 mA flows through it. What is the self inductance of the coil?

The flux linked with each turn of coil is 0.1 Wb and total number of turns is 1000. If current passing through coil is 10 amp, then self inductance of coil is ...... mH

In AC generator, induced emf is zero at time t = 0. The induced emf at time pi/(2omega) is ____

The flux linked per each turn of a coil of N turns changes from phi_1 to phi_2 . If the total resistance of the circuit including the coil is R. The induced charge in the coil is _____

When current passing through a coil increases, direction of induced emf is

KUMAR PRAKASHAN-ELECTROMAGNETIC INDUCTION-Section D MCQs (MCQs asked in Competitive Exams )
  1. Three pure inductance each of 3 H are connected as shown in figure. Th...

    Text Solution

    |

  2. Two coils are placed closed to each other. The mutual inductance of th...

    Text Solution

    |

  3. When electric current in a coil steadily changes from +2 A to -2 A is ...

    Text Solution

    |

  4. A coil having n turns and resistance ROmega is connected with a galva...

    Text Solution

    |

  5. In a uniform magnetic field of induction B a wire in the form of a sem...

    Text Solution

    |

  6. One conducing U tube can be slide inside another as shown in figure, m...

    Text Solution

    |

  7. Which of the following units denotes the dimension M^1 L^2 Q^(-2) ? (w...

    Text Solution

    |

  8. The flux linked with a coil at any instant 't' is given by phi=10t^2-5...

    Text Solution

    |

  9. Two coaxial solenoids are made by winding thin insulated wire over a p...

    Text Solution

    |

  10. In a coil of resistance 100 Omega , a current is induced by changing t...

    Text Solution

    |

  11. A planar loop of wire rotates in a uniform magnetic field. Initially a...

    Text Solution

    |

  12. The given loop is kept in a uniform magnetic field perpendicular to th...

    Text Solution

    |

  13. A conducting square frame of side 'a' and a long straight wire carryin...

    Text Solution

    |

  14. An electron moves on a straight line path XY as shown. The abcd is a c...

    Text Solution

    |

  15. A long solenoid has 1000 turns. When a current of 4 A flows through it...

    Text Solution

    |

  16. A uniform magnetic field is restricted within a region of radius r. Th...

    Text Solution

    |

  17. A circular coil of radius 10 cm, 500 turns and resistance 2Omega is pl...

    Text Solution

    |

  18. A bulb connected in series with an air-cored solenoid is lit by an a.c...

    Text Solution

    |

  19. Inside a parallel plate capacitor the electric field E varies with tim...

    Text Solution

    |

  20. The magnetic potential energy stored in a certain inductor is 25 mJ, w...

    Text Solution

    |