Rate of change of torque with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B when
θ = 45o
θ = 60o
θ = 0o
θ = 90o
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
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 of magnetic moment is placed in a magnetic field of induction . The torque exerted on it is
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
For protecting a sensitive equipment from the external magnetic field, it should be
Placed inside an aluminium can
Placed inside an iron can
Wrapped with insulation around it when passing current through it
Surrounded with fine copper sheet
The dimensions of magnetic dipole moment will be
LA
ML-1 A
ML-1 A -2
L2 A
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 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
