Vertical component of earth's magnetic field is zero at a place where angle of dip is
45o
90o
0o
60o
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 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
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
Paramagnetism
Anti-ferromagnetism
No magnetic property
Diamagnetism
The angle of dip is 90o at
Earth's magnetic poles
Equator
Both (1) and ( 2)
None of these
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
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
A diamagnetic substance is brought near a strong magnet, then it is
Attracted by a magnet
Repelled by a magnet
Repelled by north pole and attracted by south pole
Attracted by north pole and repelled by south pole
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
