Home
Class 12
PHYSICS
The magnetic flux across a loop of resis...

The magnetic flux across a loop of resistance `10Omega` is given by `phi = 5t^2 -4t +1` induced in the loop after 0.2 sec ?

A

0.4 A

B

0.2 A

C

0.04 A

D

0.02 A

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER 2009

    WB JEE PREVIOUS YEAR PAPER|Exercise Multiple Choice Questions (Physics)|40 Videos

  • QUESTION PAPER 2011

    WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS|39 Videos

Similar Questions

Explore conceptually related problems

The magnetic flux linked with a coil is phi = (3t^2- 2t + 2) mwb. What emf is induced in the coil at t = 1 sec?—

At time t the magnetic flux is given by- phi = 5t^3- 100t + 300 . What will.be the induced emf after 3 sec?

A coil of resistance 100 Omega having 100 turns is placed in a magnetic field. A galvanometer of resistance 400 Omega is connected in series with it. If the coil is brought from the present magnetic field to another magnetic field in (1)/(10)s , determine the average emf and the current. Given, the initial and final magnetic flux linked with each turn of the coil are 1 mWb and 0.2 mWb respectively.

A circular coil of radius 8.0 cm and 20 turns rotates about its vertical diameter with an angular speed of 50 rad. s^(-1) in a uniform horizontal magnetic field of magnitude 3.0xx10^(-2)T . Obtain the maximum and average emf induced in the coil. If the coil forms a closed loop of resistance 10 Omega , calculate the maximum value of current in the coil. Calculate the average power loss due to Joule heating. Where does this power come from?

A magnet is being brought near a circular coil, of radius 10 cm, having 10 turns and of resistance 10Omega , along its axis. Due to this, if the magnetic flux density linked with the coil increases from 0.1 Wb. m^(-2) to 0.5 Wb.m^(-2)" in "(1)/(10)s , find out the current induced in the coil.

A square loop of wire of side 10 cm is placed at angle of 45^(@) with a magnetic field that changes uniformly from 0.2 T to zero in 1 second. Find the current induced in the loop of resistance 1 Omega .

The flux at any time t is phi = 10t^2- 50t + 250 what will be the induced emf after 3seC?

Two batteries with emf 12 V and 13V are connected in parallel across a load resistor of 10Omega . The internal resistances of the two batteries are 1Omega and 2Omega respectively . The voltage across the load lies between

The instantaneous magnetic flux phi in a, circuit is phi = 4t^2 - 4t + 1 . The total resistance of the circuit is 10Omega . At t = 1/2s , the induced current is—

The magnetic flux through a coil is varying according to the relation phi=(4t^(2)+2t-5)Wb , t measured in seconds. Calculate the induced current through the coil at t = 2s, if the resistance of the coil is 5Omega .

WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2010-PHYSICS
  1. The ratio of magnetic field and magnetic moment at the centre of a cur...

    Text Solution

    |

  2. The current through a coil of self inductance L = 2mH is given by I=t^...

    Text Solution

    |

  3. The magnetic flux across a loop of resistance 10Omega is given by phi...

    Text Solution

    |

  4. The decimal equivalent of the binary number (11010.101)(2) is

    Text Solution

    |

  5. In a common emitter configuration, a transistor has beta=50 and input...

    Text Solution

    |

  6. Half-life of a radioactive substance is 20 minute. The time between 20...

    Text Solution

    |

  7. The energy released by the fission of one uranium atom is 200 MeV. The...

    Text Solution

    |

  8. A body is projected with a speed u m/s at an angle beta with the hori...

    Text Solution

    |

  9. A ball is projected horizontally with a velocity of 5 m/s from the top...

    Text Solution

    |

  10. A stone falls freely from rest and the total distance covered by it in...

    Text Solution

    |

  11. Two blocks of 2 kg and 1kg are in contact on a frictionless table. If ...

    Text Solution

    |

  12. If momentum is increased by 20%, then kinetic energy increases by

    Text Solution

    |

  13. A boy of mass 40 kg is climbing a vertical pole at a constant speed. I...

    Text Solution

    |

  14. The value of lamda for which the two vectors hata = 5hati+lamdahatj+...

    Text Solution

    |

  15. If veca+vecb = vecc and a+b=c then the angle included between veca an...

    Text Solution

    |

  16. The height vertically above the earth's surface at which the accelerat...

    Text Solution

    |

  17. The change in the gravitational potential energy when a body of mass m...

    Text Solution

    |

  18. A particle of mass m is attached to three identical massless springs o...

    Text Solution

    |

  19. A spring of force constant k is cut into three equal parts. The force ...

    Text Solution

    |

  20. A body floats in water with 40% of its volume outside water. When the ...

    Text Solution

    |