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 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 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
In which type of material the magnetic susceptibility does not depend on temperature?
Diamagnetic
Paramagnetic
Ferromagnetic
Ferrite
Vertical component of earth's magnetic field is zero at a place where angle of dip is
45o
90o
0o
60o
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
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 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. What is the value of n ?
2
1
0. 5
0 . 25
