The angle of dip is 90o at
earth's magnetic poles
equator
both (a ) and ( b )
centere of earth
In frequency modulation
The amplitude of modulated wave varies as frequency of carrier wave
The frequency of modulated wave varies as amplitude of modulating wave
The amplitude of modulated wave varies as amplitude of carrier wave
The frequency of modulated wave varies as frequency of modulating wave
According to Curie’s law, the magnetic susceptibility of a paramagnetic substance at an absolute temperature T is proportional to :
T2
1/T
T
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
Two bar magnets having same geometry with magnetic moment M and 2 M, are firstly placed in such a way that their similar poles are on the same side, then its period of oscillation is T1. Now the polarity of one of the magnets is reversed the time period of oscillations becomes T2. Then
T1 < T2
T1 > T2
T1 = T2
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
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
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
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
