Home
Class 12
PHYSICS
A circular coil of 20 turns each of radi...

A circular coil of 20 turns each of radius 10 cm and carrying a current of 5 A is placed in a uniform magnetic field of induction 0.10 T normal to the plane of the coil?

A

`0.314 Nm`

B

`zero`

C

`31.4 Nm`

D

`3.14 Nm`

Text Solution

Verified by Experts

The correct Answer is:
B
`tau=nIAB sin theta` but in this case `theta=0◦ therefore tau=0`
Promotional Banner

Topper's Solved these Questions

  • KINETIC THEORY OF GASES ,THERMODYNAMICS AND RADIATION

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 9|30 Videos

  • MAGNETISM

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|15 Videos

Similar Questions

Explore conceptually related problems

A circular coil of 30 turns and radius 15 cm carries a current of 5 A. placed in a uniform magnetic field of 0.2 T normal to the plane of coil. , the coil has an aren of cross section 2 xx 10^(-6)m^(2) and electron density of 10^(27) m^(-3) . Calculate the average force on each electron in the coil due to magnetic field.

A circular coil of 1 turn and area 0.01m^(2) carries a current of 10A . It is placed in a uniform magnetic field of induction 0.1 tesla such that the plane of the circle is perpendicular to the direction of the field, the torque acting on the coil is

A circular coil of 20turns and radius 10cm carries a current of 5A . It is placed in a uniform magnetic field of 0*10T . Find the torque acting on the coil when the magnetic field is applied (a) normal to the plane of the coil (b) in the plane of coil. Also find out the total force acting on the coil.

A circular coil of 200 turns, radius 5cm carries a current of 2*5A . It is suspended vertically in a uniform horizontal magnetic field of 0*25T , with the plane of the coil making an angle of 60^@ with the field lines. Calculate the magnitude of the torque that must be applied on it to prevent it from turning.

A suspended, vertical, circular coil of 50 turns and area 100cm^(2) carrying a current of 30 mA, is in equilibrium in a uniform magnetic field of intensity 0.4 tesla, when the normal to the plane of the coil makes an angle of 30^(@) with the field. Calcualte the torque on the coil due to the current.

A current of 5A flows through a circular coil of 200 turns, each of radius 20 cm. It is placed in a uniform magnetic induction of 5xx10^(-2)" Wb/m"^(2) , such that the plane of the coil is parallel to the field. What is the torque acting on the coil?

MARVEL PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT-MCQ
  1. The coild of a galvanometer consists of 100 turn and effective area 1 ...

    Text Solution

    |

  2. Two galvanometers A and B require 3 mA and 5 mA respectively to produc...

    Text Solution

    |

  3. A circular coil of 20 turns each of radius 10 cm and carrying a curren...

    Text Solution

    |

  4. When the current in a moving coil galvanometer is increased by 2 muA, ...

    Text Solution

    |

  5. A moving coil galvanometer has a current sensitivity of xx div/ma and ...

    Text Solution

    |

  6. The senstivity of a milliammeter of range 0 to 100 mA is x div/millia...

    Text Solution

    |

  7. A conducting circular loop of radius r carries a constant i. It is pla...

    Text Solution

    |

  8. Sensitivity of a moving coil galvanometer can be increased by

    Text Solution

    |

  9. The magnetic field inside a solenoid is

    Text Solution

    |

  10. What is the magnetic field at the cemter of a coil in the form of a sq...

    Text Solution

    |

  11. Three moving coil galvanometer A,B and C are made of coils of thr...

    Text Solution

    |

  12. A moving coil galvanometer has 150 equal divisions. Its current sensit...

    Text Solution

    |

  13. A coil in the shape of an equilateral triangle of side l is suspended ...

    Text Solution

    |

  14. A square current carrying loop is suspended in a unifrom magnetic ...

    Text Solution

    |

  15. A moving coil galvanometer has a voltage senstivity of I division per ...

    Text Solution

    |

  16. To increase the current sensitivity of a moving coil galvanometer by 5...

    Text Solution

    |

  17. If only 1% of the total current is to be passed through a galvanometer...

    Text Solution

    |

  18. A galvanometer having a resistance of 18 Omega is shunted by a wire of...

    Text Solution

    |

  19. An ammeter has a resistance R and a range I. To increase its range to ...

    Text Solution

    |

  20. When a current of 1 Ampere is passed through a galvanometer coil, it i...

    Text Solution

    |