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The magnetic needle of a vibration magne...

The magnetic needle of a vibration magnetometer makes `12` oscillations per minute in the horizontal component of earth's magnetic field. When an external short bar magnet is placed at some distance along the axis of the needle in the same line it makes `15` oscillations per minute. If the poles of the bar magnet are inter changed, the number of oscillations it takes per minute is

A

`sqrt(61)`

B

`sqrt(63)`

C

`sqrt(65)`

D

`sqrt(67)`

Text Solution

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The correct Answer is:
B
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The magnetic needle of a vibration magnetometer makes 12 oscillations per minute in the horizontal component of earths magnetic field. When an external short bar magnet is placed at some distance along the axis of the needle in the same line, it makes 15 oscillations per minute. If the poles of the bar magnet are interchanged, the number of oscillations it makes per minute is sqrtn . What is the value of n?

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Knowledge Check

  • The magnetic needle of an oscillation magnetometer makes 10 oscillations per minut under the action of earth's magnetic field along. When a bar magnet is placed at some distance along the axis of the needle it makes 14 oscillations per minute. If the bar magnet is turned so that its poles interchange their position, then the new frequency of oscillation of the needle is:

    A
    `10` vibrations per minute
    B
    `14` vibrations per minute
    C
    `4` vibrations per minute
    D
    `2` vibration per minute

  • A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magnetic moment is quadrupled and the earth's field is doubled, the number of oscillations mode per minute would be

    A
    `n/(2sqrt(2))`
    B
    `n/sqrt(2)`
    C
    `2sqrt(2n)`
    D
    `sqrt(2n)`

  • A small magnetic needle performs 10 oscillations/minute in the earth's horizontal magnetic field . When a bar magnet is placed near the small magnet in same position , frequency of oscillations becomes 10sqrt2 oscillations/minute . If the bar magnet be turned around end to end , the rate of oscillation of small magnet will become

    A
    `5 sqrt2`/min
    B
    `20sqrt2`/min
    C
    `2sqrt2`/min
    D
    Zero

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