Home
Class 12
PHYSICS
A small coil is introduced between the p...

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is `n` and the cross sectional area of the coil is `A`. When the coil turns through `180^(@)` about its diameter, the charge flowing through the coil is `Q`. the total resistance of the circuit is `R`. what is the magnitude of the magnetic induction?

A

`(QR)/(nA)`

B

`(2QR)/(nA)`

C

`(Qn)/(2RA)`

D

`(QR)/(2nA)`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • ELECTRO MAGNETIC INDUCTION

    ERRORLESS |Exercise Assertion & Reason|5 Videos

  • CURRENT ELECTRICITY

    ERRORLESS |Exercise Self Evaluation Test -19|23 Videos

  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT AND X-RAYS

    ERRORLESS |Exercise Self Evaluation Test|3 Videos

Similar Questions

Explore conceptually related problems

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The cross-sectional area of the coil is equal to S = 3.0 mm^2 , the number of turns is N = 60 . When the coil turns through 180^@ about its diameter, a galvanometer connected to the coil indicates a charge q = 4.5muC flowing through it. Find the magnetic induction magnitude between the poles, provided the total resistance of the electric circuit equals R = 40 Omega .

A small coll is intorduced between the poles of an electromagnent so that its axis coincides with the magnetic field direction. The cross sectional ara of the coil is equal to S = 30 mm^(2) , the its diameter a balistic galvanometer connected to the coil indicates a charge q = 4.5 muC flowing through it. Find the magnetic induction magnitude between the poles provided the total resistance of the electric circuit equals R = 40 Omega

If the magnetic field is doubled through a coil of number of turns 'n' then the induced emf will be

A coil of copper having 1000 turns is placed in a magnetic field B=4xx10^(-3)T perpendicular to its plane. The cross-sectional area of the coil is 0.05m^(2) . If it turns through 180^(@) in 0.01s , then the e.m.f induced in the coil is

A flat circular coil of n turns, area A and resitance R is placed in a uniform magnetic field B . The pane of coil is initially perpedicular of B . when the coil is rotated through an angle of 180^@ about one of its diameter, a charge Q_1 flows through the coil When the same coil after charge Q_2 flows through it. then Q_2//Q_1 is

What is magnetic flux linked with a coil or N turns or are cross section A held with its plane parallel to the field?

A flip coil consits of N turns of circular coils which lie in a uniform magnetic field. Plane of the coils is perpendicular to the magnetic field as shown in figure. The coil is connected to a current integrator which measures the total charge passing through it. The coil is turned through 180^(@) about the diameter. The charge passing through the coil is

A 100 turn closely wound circular coil of radius 10cm carries a current of 3*2A . (i) What is the field at the centre of the coil? (ii) What is the magnetic moment of this arrangement? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^@ under the influence of the magnetic field. (iii) What are the magnitudes of the torques on the coil in the initial and final positions? (iv) What is the angular speed acquired by the coil when it has rotated by 90^@ ? The moment of inertia of the coil is 0*1kgm^2 .

ERRORLESS -ELECTRO MAGNETIC INDUCTION-SET
  1. The figure shows four wire loops, with edge length of either L or 2L. ...

    Text Solution

    |

  2. A circular coil and a bar magnet placed nearby are made to move in the...

    Text Solution

    |

  3. A square coil ABCD lying in x-y plane with its centre at origin. A lon...

    Text Solution

    |

  4. A short magnet is allowed to fall from rest along the axis of a horizo...

    Text Solution

    |

  5. The horizontal component of the earth's magnetic field at a place is 3...

    Text Solution

    |

  6. A copper disc of radius 0.1 m rotates about its centre with 10 revolut...

    Text Solution

    |

  7. A coil of Cu wire (radius r, self-inductance L) is bent in two concen...

    Text Solution

    |

  8. In which of the following circuits is the current maximum just after t...

    Text Solution

    |

  9. A small coil is introduced between the poles of an electromagnet so th...

    Text Solution

    |

  10. Two circular coils A and B are facing each other as shown in figure. T...

    Text Solution

    |

  11. A conductuing loop having a capacitor is moving outward from the magne...

    Text Solution

    |

  12. A straight wire of length L is bent into a semicircle. It is moved in ...

    Text Solution

    |

  13. If in a coil rate of change of area is (5meter^(2))/(milli second)and ...

    Text Solution

    |

  14. In series with 20 ohm resitor a 5 henry inductor is placed. To the com...

    Text Solution

    |

  15. Two circular coils P & Q are coaxially & carry currents I1 and I2 resp...

    Text Solution

    |

  16. The phase difference between the flux linkage and the induced e.m.f. i...

    Text Solution

    |

  17. A pair of parallel conducting rails lie at right angle to a uniform ma...

    Text Solution

    |

  18. The magnetic field in the cylindrical region shown in figure increase ...

    Text Solution

    |

  19. An aircraft with a wingspan of 40 m flies a speed of 1080 km hr(1) in ...

    Text Solution

    |

  20. A hundred turns of insulated copper wire are wrapped around an iron cy...

    Text Solution

    |