Home
Class 12
PHYSICS
Each atom of an iron bar (5cmxx 1cm xx 1...

Each atom of an iron bar `(5cmxx 1cm xx 1cm) `has a magnetic moment `1.8xx10^(-23)Am^2.`
What will be the torque required to place this magnetised bar perpendicular to magnetic field of 15000 gauss?
Density of iron =`7.8xx10^3kg//m^3,` Atomic wt. of iron =56,
Avogadro's number =`6.023xx10^(23)//gm `mole.

Promotional Banner

Topper's Solved these Questions

  • MAGNETIC DIPOLE & EARTH'S MAGNETISM

    MODERN PUBLICATION|Exercise EXERCISE|93 Videos

  • Interference of Light

    MODERN PUBLICATION|Exercise EXERCISE|97 Videos

  • MAGNETIC EFFETS OF CURRENT

    MODERN PUBLICATION|Exercise EXERCISE|37 Videos

Similar Questions

Explore conceptually related problems

Each atom of an iron bar (5cmxx 1cm xx 1cm) has a magnetic moment 1.8xx10^(-23)Am^2. Knowing that the density of iron is 7.78×10 ^3 kgm -3 , atomic weight is 56 amu and avogadro's number is 6.02×10^ 23What will be the magnetic moment of the bar in the state of magnetic saturation.

A magnet weighs 75 g and its magnetic moment is 2xx10^-4 A m^2 . If the density of the material of the magnet is 7.5 xx 10^3 kg m^-3 , calculate the intensity of magnetisation.

A magnetised needle of magnetic moment 4.8 xx 10^-2JT^-1 is placed at 30^@ with the direction of uniform magnetic field of magnitude 3xx10^-2T . Calculate the torque acting on the needle.

A proton of velocity of 10^8 cms^-1 is moving perpendicular to a uniform magnetic field of 10 kilogauss. What is the sideway force actig on the proton of charge e = 4.8 xx 10^10 e.s.u.?

Given that resistivity of copper is 1.68 xx 10^-8Omega m. Calculate the amount of copper required to draw a wire 10 km long having resistane 10Omega . The density of copper is 8.9 xx 10^3 kg m^-3

Two identical short bar magnets each of magnetic moment 12.5Am^2 are placed at a separation of 10cm between their centres, such that their axes are perpendicular to each other. Find the magnetic field at a point midway between the two magnets.

Electrons move at right angles to a magnetic field of 100 gauss and enter it with a velocity fo 2xx10^10 cms^-1 . Find the radius of their circular path. Given e//m = 1.7 xx 10^7 e.m.u g^-1

Calculate the most probable speed of a molecule of hydrogen at N.T.P. The Boltzmann constant is 1.38 xx 10^-23 J per degree and Avogadro's number is 6 xx 10^26 per kg mole.

MODERN PUBLICATION-MAGNETIC DIPOLE & EARTH'S MAGNETISM-EXERCISE
  1. Each atom of an iron bar (5cmxx 1cm xx 1cm) has a magnetic moment 1.8x...

    Text Solution

    |

  2. State four properties of bar magnet.

    Text Solution

    |

  3. Explain the magnetism on the basis of atomic theory.

    Text Solution

    |

  4. Define magnetic pole.

    Text Solution

    |

  5. What is a magnetic dipole? Define magnetic dipole moment. Give its SI ...

    Text Solution

    |

  6. A current loop behaves as a mgnetic dipole. Obtain expression for magn...

    Text Solution

    |

  7. In a hydrogen atom, an electron of charge e revolves in an orbit of ra...

    Text Solution

    |

  8. Explain how an atom behaves as a magnetic dipole. derive an expression...

    Text Solution

    |

  9. Deduce the expression for the magnetic dipole moment of an electron or...

    Text Solution

    |

  10. Derive an expression for the magnetic dipole moment of an atom.

    Text Solution

    |

  11. Deduce the expression for the magnetic dipole moment of an electron or...

    Text Solution

    |

  12. What is the relationship between the current and the magnetic moment o...

    Text Solution

    |

  13. Derive an expression for the magnetic dipole moment of an atom.

    Text Solution

    |

  14. Explain how an atom behaves as a magnetic dipole. derive an expression...

    Text Solution

    |

  15. What do you understand by magnetic field ? Define its strength and SI ...

    Text Solution

    |

  16. Define magnetic field intensity at a point and derive an expression fo...

    Text Solution

    |

  17. Obtain an expression for electric field intensity at any point on equi...

    Text Solution

    |

  18. What is magnetic dipole? Derive an expression for magnetic field inten...

    Text Solution

    |

  19. Derive an expression for the magnetic field due to magnetic dipole in ...

    Text Solution

    |

  20. Derive an expression for the torque expereinced by a amgnetic dipole s...

    Text Solution

    |

  21. Derive an expression for torque acting on a bar magnet placed in a uni...

    Text Solution

    |