The angle of dip is 90o at
earth's magnetic poles
equator
both (a ) and ( b )
centere of earth
In which type of material the magnetic susceptibility does not depend on temperature?
Diamagnetic
Paramagnetic
Ferromagnetic
Ferrite
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
A bar magnet is oscillating in earth’s magnetic field with a period T. What happen to its period of motion, if its mass is quadrupled?
Motion remains simple harmonic with new period = T/2
Motion remains simple harmonic with new period = 2 T
Motion remains simple harmonic with new period = 4 T
Motion remains simple harmonic and the period stays nearly constant
A bar magnet has a magnetic moment of 2.5 JT-1 and is placed in a magnetic field of 0.2 parallel to anti parallel position relative to the field direction is :
zero
0.5 J
2.0 J
1 J
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
Rate of change of torque with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B when the angle is :
θ = 45o
θ = 60o
θ = 0o
θ = 90o
Vertical component of earth's magnetic field is zero at a place where angle of dip is
45o
90o
0o
60o
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
According to Curie’s law, the magnetic susceptibility of a paramagnetic substance at an absolute temperature T is proportional to :
T2
1/T
T