CBSE  /  Class 12  /  Physics  /  Magnetism and Matter

  • 1. 
    S.I. unit of flux is :

  • Ohm
  • Weber
  • Tesla
  • None

  • 2. 
    What is the angle of dip at a place where the horizontal component of earth's magnetic field is equal to the vertical component?

  • 0°
  • 30°
  • 45°
  • 90°

  • 3. 
    Which of the following has a low value in ferrites?

  • Conductivity
  • Permeability
  • Magnetic susceptibility
  • All the above

  • 4. 
    The dimensional representation of magnetic flux density is :

  • [MLT-2]
  • [MLT-2A-1]
  • [MLT-2A-2]
  • [MT-2A-1]

  • 5. 
    Tangent law is applicable only when:

  • two uniform and mutually perpendicular magnetic fields exist
  • two magnetic fields exist
  • horizontal component of earth's magnetic field is present
  • uniform magnetic field are used

  • 6. 
    Ferrites may be:

  • ant. ferromagnetic
  • ferromagnetic
  • ferrimagnetic
  • None of the above

  • 7. 
    A magnetic bar of M magnetic moment is placed m the field of magnetic strength B, the torque acting on it is :

  • \(\vec{M}\).\(]\vec{B}\)
  • -\(\vec{M}\).\(\vec{B}\)
  • \(\vec{M}\) × \(\vec{B}\).
  • \(\vec{B}\) × \(\vec{M}\)

  • 8. 
    The magnetic lines of force inside a bar magnet:

  • do not exist
  • depends on area of cross-section of bar magnet
  • are from N-pole to S-pole of the magnet
  • are from S-pole to N-pole of the magnet.

  • 9. 
    A magnetic dipole moment is a vector quantity directed from:

  • S to N
  • N to S
  • E to W
  • W to E

  • 10. 
    What is the magnetic field in the empty space enclosed by the toroidal solenoid of radius ‘R’? ,

  • Infinity
  • \(\frac{µ_0}{4π}\).\(\frac{2πl}{R}\)
  • \(\frac{µ_0}{4π}\).(\(\frac{πl}{R}\))
  • zero
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