According to Curie’s law, the magnetic susceptibility of a paramagnetic substance at an absolute temperature T is proportional to :
T2
1/T
T
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
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
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
The angle of dip is 90o at
earth's magnetic poles
equator
both (a ) and ( b )
centere of earth
A bar magnet of magnetic moment is placed in a magnetic field of induction . The torque exerted on it is :
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 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
The dimensions of magnetic dipole moment will be :
LA
ML-1 A
ML-1 A -2
L2 A
