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
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
Vertical component of earth's magnetic field is zero at a place where angle of dip is
45o
90o
0o
60o
A bar magnet of magnetic moment is placed in a magnetic field of induction . The torque exerted on it is :
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
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
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
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
If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is
repelled by both the poles
repelled by the north pole and attracted by the south pole
attracted by the north pole and repelled by the south pole
attracted by both the poles
