Home
Class 12
PHYSICS
A circular coil of radius 20 cm and 20 t...

A circular coil of radius `20 cm` and `20` turns of wire is mounted vertically with its plane in magnetic meridian.A small magnetic needle (free to rotate about vertical axis) is placed at the center of the coil.It is deflected through `45^(@)` when a current is passed through the coil and in equilbrium (Horizontal component of earth's field is `0.34 xx 10^(-4) T`).The current in coil is:

Text Solution

Verified by Experts

The correct Answer is:
0.573 A
Promotional Banner

Topper's Solved these Questions

  • GALVANOMETERS: AMMETER AND VOLTMETERS

    NN GHOSH|Exercise Exercise|32 Videos

  • FUNDAMENTAL OF CURRENT ELECTRICITY

    NN GHOSH|Exercise Exercises|45 Videos

  • GAUSS THEOREM AND ITS APPLICATION

    NN GHOSH|Exercise EXAMPLES(a)|24 Videos

Similar Questions

Explore conceptually related problems

A 2 turn coil of radius 10cm is placed with its plane in magnetic meridian. A small magnetic needle is suspended at the centre of the coil by a torsion free silk thread. On passing a current through the coil, the needle is deflected through 45^@ . Calculate the strength of the current if horizontal component of earth's field is 1*6xx10^-5T

A circular coil of radius 40 mm consists of 250 turns of wire in which the current is 20 mA. The magnetic field at the centre of the coil is

A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 weber//m^(2) . The magnetic dipole moment of the coil is

A circular coil of radius 10 cm, 500 turns and resistance 2 Omega is placed with its plane prependicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through 180^(@) in 0.25 s. Estimate the magnitude of the e.m.f and current induced in the coil. Horizotal component of earth's magnetic field at the place is 3 xx 10^(-5) T .

A circular loop of mean radius 5 cm, which has 40 turns of insulated copper wire, is placed in the magnetic meridian. A compass needle is placed at the center of the loop. What direction is produced by a current of 0.1 A through the coil? (H-vector of the earth's field at the place = 29 A m^(-1)

A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the center of the coil is

A circular of radius 0.157 m has turns. It is placed such that its axis is in magnetic meridian. A dip needle is supported at the centre of the coil with its axis of rotation horizontal, and in the plane of the coil. The angle of dip is 30^(@) when a current flows through the coil. The angle of dip becomes 60^(@) on reversing the current. Find the current in the coil assuming that the magnetic field due to the coil is smaller than the horizontal component of earth's magnetic field, H =3xx10^(-5) T .

A tangent galvanometer shown a deflection of 45^@ when 10 mA of current is passed through it. If the horizontal component of the earth's magnetic field is B_H = 3.6 xx 10^(-5) T and radius of the coil is 10cm , find the number of turns in the coil.

A coil of radius 10 cm and resistance 40 Omega has 1000 turns. It is placed with its plane vertical and its axis parallel to the magnetic meridian. The coil is connected to a galvanometer and is rotated about the vertical diameter through an angle of 180^@ . Find the charge which flows through the galvanometer if the horizontal component of the earth's magnetic field is B_H = 3.0X 10^(-5) T .

NN GHOSH-GALVANOMETERS: AMMETER AND VOLTMETERS-Exercise
  1. A circular coil of radius 20 cm and 20 turns of wire is mounted vertic...

    Text Solution

    |

  2. Calculate the current through a tangent galvanometer whose cells has 5...

    Text Solution

    |

  3. A current is sent through two tangent galvenometers in series. The def...

    Text Solution

    |

  4. Show that a tangent galvanometer is most sensitive when the deflection...

    Text Solution

    |

  5. The total resistance of a simple circuit is 80 Omega including the res...

    Text Solution

    |

  6. A tangent galvanometer of resistance 10Omega shows a deflection of 60^...

    Text Solution

    |

  7. A circular loop of 50 turns and an area of 20 cm^(2) is placed in a ma...

    Text Solution

    |

  8. A galvanometer coil of rectangular shape of length 4 cm and width 2 cm...

    Text Solution

    |

  9. A moving coild galvanometer with a lamp-and-scale arrangement has a co...

    Text Solution

    |

  10. In a moving coil galvanometer, the magnetic field used is 5T. The coil...

    Text Solution

    |

  11. A milliammeter has a resistance of 10Omega and each division of its gr...

    Text Solution

    |

  12. A moving coil galvanometer has a resistance of 200Omega and gives a fu...

    Text Solution

    |

  13. A voltmeter with a resistance of 8000Omega is used to measure the emf ...

    Text Solution

    |

  14. A cheap voltmeter with an internal resistance of 30Omega is connected ...

    Text Solution

    |

  15. A voltmeter of range of 10 V and resistance 5000 Omega is connected in...

    Text Solution

    |

  16. There is a milliameter, each division of which reads 1 mA. It has a re...

    Text Solution

    |

  17. An ammeter of resistance 0.02 Omega is connected in the usual may to a...

    Text Solution

    |

  18. A voltmeter of resistance 3000Omega can read up to 10 V. how would you...

    Text Solution

    |

  19. A millimmater of resistance 20Omega reads up to 50 mA. Explain how the...

    Text Solution

    |

  20. A battery of emf 5V and internal resistance 20Omega is connected to a ...

    Text Solution

    |