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Magnetism and Matter
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Magnetism and Matter
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14 Questions

1. There are four light-“weight-“rod samples A - B - C - Dseparately suspended by threadsA bar magnet is slowlybrought near each sample and the followingobservations are noted(i) A is feebly repelled(ii) B is feebly attracted(iii) C is strongly attracted(iv) D remains unaffectedWhich one of the following is true? [2011]
2. A short bar magnet of magnetic moment0.4JT -“1 isplaced in a uniform magnetic field of0.16 TThe magnetis in stable equilibrium when the potential energy is[2011M]
3. A compass needle which is allowed to move in ahorizontal plane is taken to a geomagnetic poleIt:[2012]
4. Two magnets of magnetic moments M and 2Mareplaced in a vibration magnetometer - with the identicalpoles in the same directionThe time period of vibrationis T1If the magnets are placed with opposite polestogether and vibrate with time period T2 - then [2002]
5. A diamagnetic material in a magnetic field moves
6. A bar magnet - of magnetic moment M - is placed in amagnetic field of induction BThe torque exerted on it is[1999]
7. A compass needle which is allowed to move in ahorizontal plane is taken to a geomagnetic poleIt:[2012]
8. Curie temperature is the temperature above which[2008]
9. A bar magnet - of magnetic moment M - is placed in amagnetic field of induction BThe torque exerted on it is[1999]
10. Above Curie temperature [2006]
11. A bar magnet having a magnetic moment of 2× 10 4JT-“1 is free to rotate in a horizontal planeA horizontalmagnetic field B= 6 × 10 -“4 Texists in the spaceThe workdone in taking the magnet slowly from a directionparallel to the field to a direction 60° from the field is[2009]
12. A bar magnet having a magnetic moment of 2× 10 4JT-“1 is free to rotate in a horizontal planeA horizontalmagnetic field B= 6 × 10 -“4 Texists in the spaceThe workdone in taking the magnet slowly from a directionparallel to the field to a direction 60° from the field is[2009]
13. Two magnets of magnetic moments M and 2Mareplaced in a vibration magnetometer - with the identicalpoles in the same directionThe time period of vibrationis T1If the magnets are placed with opposite polestogether and vibrate with time period T2 - then [2002]
14. A bar magnet of magnetic moment M is placed atright angles to a magnetic induction BIf a force F isexperienced by each pole of the magnet - the length of themagnet will be [NEETKar2013]

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