Above curie temperature
A ferromagnetic substance becomes paramagnetic
A paramagnetic substance becomes diamagnetic
A diamagnetic substance becomes paramagnetic
A paramagnetic substance becomes ferromagnetic
Vertical component of earth's magnetic field is zero at a place where angle of dip is
45o
90o
0o
60o
The dimensions of magnetic dipole moment will be
LA
ML-1 A
ML-1 A -2
L2 A
The angle of dip is 90o at
Earth's magnetic poles
Equator
Both (1) and ( 2)
None of these
A diamagnetic material in a magnetic field moves
Perpendicular to the field
From weaker to the stronger parts of the field
From stronger to the weaker parts of the field
In none of the above directions
The work done in turning a magnet of magnetic moment M by an angle of 90o from the meridian, is n times the corresponding work done to turn it through an angle of 60o. The value of n is given by
2
1
0.5
0.25
A bar magnet is placed with its north pole pointing earth’s north. The points of zero magnetic field will be which direction from the centre of the magnet?
North and South
East and West
North-east and South-west
North-east and South-east
Due to the earth’s magnetic field, charged cosmic ray particles
Can never reach the poles
Can never reach the equator
Require less kinetic energy to reach the equator than the poles
Require greater kinetic energy to reach the equator, than the poles
A bar magnet having a magnetic moment of 2 × 10 4 JT -1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 × 10-4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60o from the field is
0.6 J
12 J
6 J
2 J
In which type of material the magnetic susceptibility does not depend on temperature?
Diamagnetic
Paramagnetic
Ferromagnetic
Ferrite