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
The angle of dip is 90o at
earth's magnetic poles
equator
both (a ) and ( b )
None of these
Vertical component of earth's magnetic field is zero at a place where angle of dip is
45o
90o
0o
60o
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
para magnetism
anti-ferro magnetism
no magnetic property
diamagnetism
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 bar magnet is placed with its north pole pointing earth’s north. The points of zero magnetic field will be which direction from the center of the magnet?
north and south
east and west
north-east and south-west
north-east and south-east
Above curie temperature
a ferromagnetic substance becomes paramagnetic
a paramagnetic substance becomes diamagnetic
a diamagnetic substance becomes paramagnetic
a paramagnetic substance becomes ferromagnetic
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
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
The dimensions of magnetic dipole moment will be
LA
ML-1 A
ML-1 A -2
L2 A
