Home
Class 12
PHYSICS
A bar magnet suspended freely in a unifo...

A bar magnet suspended freely in a uniform magnetic field is vibrating with a time period of 3s. If the field strength is increased to 4 times of the earlier field strength, then the time period (in second) will be

A

12

B

6

C

1.5

D

0.75

Text Solution

Verified by Experts

The correct Answer is:
C
`T = 2pi sqrt(1/(MB))`
`T prop 1/sqrt(B)`
`T_(1)/T_(2) = sqrt(B_(1)/B_(2)) rArr 3/T_(2) = sqrt(4/1)`
`T_(2) = 1.5` sec
Promotional Banner

Topper's Solved these Questions

  • MAGNETISM AND MATTER

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |10 Videos

  • MAGNETISM AND MATTER

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |10 Videos

  • LAWS OF MOTION

    PHYSICS WALLAH|Exercise NEET PAST 5 YEARS QUESTIONS |12 Videos

  • MECHANICAL PROPERTIES OF MATTER

    PHYSICS WALLAH|Exercise NEET Past 5 Yeats Questions|16 Videos

Similar Questions

Explore conceptually related problems

A bar magnet suspended freely in uniform magnetic field is vibrating with a time period of 3 seconds. If the initial field strength is 2T . Then the final field strength, for which time period becomes 4 seconds is

If a charged particle is a plane perpendicular to a uniform magnetic field with a time period T Then

A bar magnet is oscillating in the earth's magnetic field with a time period T . If the mass is increased four times, then its time period will be:

A magnent when suspended freely in earth's magnetic field, oscillates with a time period T. It is replaced by a magnet of magnetic moment four times that of the original one. What will be the new time period?

A bar magnet is oscillating in the earth's magnetic field with a time period T . If the mass is quadrupled, then its time period will be:

The length, breadth and mass of two bar magnets are same but their magnetic moments are 3M and 2M respectively. These are joined pole to pole and are suspended by a string. When oscillated in a magnetic field of strength B, the time period obtained is 5s. If the poles of either of the magnets are reverse then the time period of the combination in the same magnetic field will be –

The time period of a freely suspended bar magnet in a field is 2s. It is cut into two equal parts along its axis, then the time period is

A magnetic needle is made to vibrate in uniform field H , then its time period is T . If it vibrates in the field of intensity 4H , its time period will be

A thin magnetic iron rod of length 30 cm is suspended in a uniform magnetic field. Its time period of oscillation is 4s. It is broken into three equal parts. The time period in second of oscillation of one part. When suspended in the same magnetic field, is

PHYSICS WALLAH-MAGNETISM AND MATTER -LEVEL 2
  1. if B(y) = 1/sqrt(3)B(y), then find the angle of dip:

    Text Solution

    |

  2. The earth's magnetic field at a certain place has a horizontal compone...

    Text Solution

    |

  3. A bar magnet suspended freely in a uniform magnetic field is vibrating...

    Text Solution

    |

  4. The time period of a freely suspended bar magnet in a field is 2s. It ...

    Text Solution

    |

  5. The work done in turning a magnet of magnetic moment M by an angle of...

    Text Solution

    |

  6. The magnet of vibration magnetometer is heated so as to reduce its mag...

    Text Solution

    |

  7. The susceptibility of annealed iron at saturation is 5500. Find the pe...

    Text Solution

    |

  8. The magnetic susceptibility of a paramagnetic substance at -73^@C is 0...

    Text Solution

    |

  9. The relative permeability of iron is 6000. Its magnetic susceptibilit...

    Text Solution

    |

  10. Which one is not diamagnetic substance?

    Text Solution

    |

  11. The work done in turning a magnet of magnetic moment M by an angle of...

    Text Solution

    |

  12. Work done in rotating a bar magnet from 0 to angle theta is:

    Text Solution

    |

  13. A magnetic needle lying parallel to a magnetic field requires W units ...

    Text Solution

    |

  14. In which type of material the magnetic susceptibility does not depend ...

    Text Solution

    |

  15. For a permanent magnet the properties retentivity and coercivity are r...

    Text Solution

    |

  16. In a permanent magnet at room temperature.

    Text Solution

    |

  17. A 250-turns recantagular coil of length 2.1 cm and width 1.25 cm ca...

    Text Solution

    |

  18. Soft iron is used for making electromagnet because it

    Text Solution

    |

  19. If the total magnetic field strength (H) due to the earth is 28 Am^-1 ...

    Text Solution

    |

  20. There are four light-weight-rod sample A, B, C, D separately suspended...

    Text Solution

    |