JEE Questions for Physics Magnetism And Matter Quiz 14 - MCQExams.com

A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?
  • Yes
  • No
  • May be or may not be move
  • Nothing can be said
The magnet of vibration magnetometer is heated so as to reduce its magnetic moment by 36%. By doing this the periodic time of the magnetometer will
  • Increases by 36%
  • Increases by 25%
  • Decreases by 25%
  • Decreases by 345
The ratio of magnetic moments of two bar magnets is 13 : 5. These magnets held together in a vibration magnetometer oscillate with 15 oscillations per minute in earth’s magnetic field with like poles together. What will be the frequency of oscillations of system if unlike poles are together
  • 10 oscillations / min
  • 15 oscillations / min
  • 12 oscillations / min

  • Physics-Magnetism and Matter-78352.png
A magnet is suspended horizontally in the earth’s magnet field. When it is displaced and then released it oscillates in a horizontal plane with a period T. If a piece of wood of the same moment of inertia (about the axis of rotation) as the magnet is attached to the magnet, what would be the new period of oscillation of the system
Physics-Magnetism and Matter-78354.png

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  • 2)
    Physics-Magnetism and Matter-78356.png

  • Physics-Magnetism and Matter-78357.png

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Two short magnets of magnetic moment 1000 Am2 are placed as shown at the corners of a square of side 10 cm. The net magnetic induction at P is
Physics-Magnetism and Matter-78360.png
  • 0.1 T
  • 0.2 T
  • 0.3 T
  • 0.4 T
An electron moving around the nucleus with an angular momentum l has a magnetic moment

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  • 2)
    Physics-Magnetism and Matter-78363.png

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Two short magnets AB and CD are in the XY-plane and are parallel to X-axis and coordinates of their centres respectively are (0,and (2, 0). Line joining the North-South poles of CD is opposite to that of AB and lies along the positive X-axis. The resultant field induction due to AB and CD at a point P(2,is 100 × 10-7 T. When the poles of the magnet CD are reversed, the resultant field induction is 50 ×10-7T. The value of magnetic moments of AB and CD (in A-m2) are
  • 300 , 200
  • 600 , 400
  • 200 , 100
  • 300 , 150
0:0:1


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