What is the angle of dip at a place where horizontal component of earth's magnetic field is equal to the vertical component?
  • 30°
  • 90°
  • 45°
  • 0°
The period of oscillation of a magnet of momentum pm is 1.5s. If we use a bar magnet of same moment of inertia but moment 9pm, the time period of oscillation will be:
  • 0.5s
  • 1.5s
  • 1.0s
  • 2.0s
Which one of the Maxwell's laws leads to the conclusion that there are no magnetic field loops that are not closed?
  • Faraday's law
  • Gauss' law for magnetism correct
  • Gauss' law for electricity
  • Ampere-Maxwell law
What is the relation between dipole moment pm, volume of bar magnet V and intensity of magnetization M?
Magnetic-Field-Multiple-Choice-Questions-for-CBSE-Class-12-Physics-Topperlearning.png
  • A
  • B
  • C
  • D
If we place a bar magnet in the magnetic meridian with its north pole towards geographic north, the neutral point will be:
  • on the axial of the magnet
  • at 45° with the axial line
  • at 45° with the equatorial line
  • on the equatorial line of the magnet
Which combination of magnetic field lines and poles shows two magnets repelling each other?
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  • A
  • B
  • C
  • D
Magnetic field strength due to a short bar magnet on its axial line at a distance x is B. What is its value at the same distance on the equatorial line?
  • B/2
  • B
  • 2B
  • 4B
When the switch is closed a magnetic field is produced by the coil. Which answer shows the shape of the field?
89781_hud12-300x256.jpg
  • B correct
  • D
  • C
  • A
If the magnet is suspended at an angle 30° to the magnetic meridian, the dip needle makes an angle 60o with the horizontal. What is the true dip?
  • tan-1 (3)
  • tan-1 (3/2)
  • tan-1 (2/3)
  • tan-1 (1/3)
A compass has a small balanced pointer that always points North-South. This is because:
  • Gravity makes the needle point this way
  • the earth has a magnetic field and the pointer is magnetic
  • the stars exert a force on the needle
  • the compass needle points to cold places
What is the unit of susceptibility?
  • Am-1
  • Am2
  • No units
  • Am
The magnetic induction left behind in the sample after the magnetizing field has been removed is called
  • Hyteresis
  • Retentivity
  • Coercivity
  • Ferromagnetism
Declination is the angle between:
  • horizontal and vertical components of earth’s magnetic field
  • horizontal component and total magnetic field of the earth
  • geographic and magnetic meridian
  • geographic meridian and horizontal component of earth's magnetic field
The ferromagnetic materials can be magnetised easily because
  • Ferromagnetic materials have low susceptibility and permeability
  • Ferromagnetic materials have high susceptibility and low permeability
  • Ferromagnetic materials have high susceptibility and permeability
  • Ferromagnetic materials have low susceptibility and high permeability
What kinds of materials are used for coating magnetic tapes?
  • Diamagnetic Materials
  • Ferrites
  • Electromagnet
  • Paramagnetic materials
A particle of charge q and mass m moves in a circular orbit of radius r with angular speed. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on
  • q and m
  • ω and q
  • ω, q and m
  • ω and m
A wire of length L m carrying current i A is bent in the form of a circle. The magnitude of magnetic moment is
Magnetic-Properties-Multiple-Choice-Questions-for-CBSE-Class-12-Physics-Topperlearning.png
  • A
  • B
  • C
  • D
If the susceptibility of a metal at saturation is 4500, then what is the permeability of this metal at saturation?
  • 5.684 X 10-4 T-m/A
  • 5.654 X 10-3 T-m/A
  • 5.654 X 10-7 T-m/A
  • 5.658 X 10-5 T-m/A
The maximum value of permeability of a metal (77% Ni , 16% Fe , 5% Cu , 2% Cr) is 0.164 T-m/A. What will be the maximum relative permeability and susceptibility?
  • 1.0101 X 107 , 1.0102 X 107
  • 1.304 X 105 ; ~ 1.304 X 105
  • 1.0102 X 107 , 1.0101 X 107
  • 1.0101 X 105 , 1.0102 X 105
The units of magnetic pole strength and magnetic dipole moment of a bar magnet are
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  • A
  • B
  • C
  • D
0 h : 0 m : 1 s

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