CBSE  /  Class 12  /  Physics  /  Moving Charges and Magnetism

  • 1. 
    A wire of length 2 metre carries a current 1 ampere, is bent to form a circle. The magnetic moment of the coil is :

  • 2π
  • π/2
  • π/4
  • 1/π

  • 2. 
    The magnetic field of a given length of a ware for single turn coil at its centre is B. Then.its value for two turns of coil will be :

  • B/4
  • B/2
  • 4B
  • 2B

  • 3. 
    When charged particle enters-a uniform magnetic field, its K.E.:

  • remains constant
  • increases
  • decreases
  • becomes zero

  • 4. 
    To convert galvanometer into voltmeter one should connect :

  • high resistance in series with galvanometer
  • low resistance in series with galvanometer
  • high resistance in parallel with galvanometer
  • low resistance in parallel with galvanometer

  • 5. 
    A charge q moves in a region, where electric field E and magnetic field B both exist, then force on it is :

  • \(\vec{F}\) = q(\(\vec{v}\)×\(\vec{B}\))
  • \(\vec{F}\) = q{\(\vec{E}\)×(\(\vec{v}\) × \(\vec{B}\))}
  • \(\vec{F}\) = q(\(\vec{E}\ )+ (\(\vec{B}\) × \(\vec{v}\))
  • \(\vec{F}\) = q(\(\vec{B}\) + (\(\vec{E}\) × \(\vec{v}\))

  • 6. 
    Isoclinic lines are the lines joining places with :

  • equal dip
  • equal declination
  • equal dip and declination
  • None of these

  • 7. 
    The most suitable metal for making permanent magnets is :

  • iron
  • steel
  • copper
  • aluminium

  • 8. 
    The SI unit of magnetic dipole moment is

  • Ampere
  • Ampere metre²
  • Tesla
  • None of these

  • 9. 
    Earth's magnetism was discovered by:

  • Gauss
  • Oersted
  • Ampere
  • Gilbert

  • 10. 
    According to Gauss's theorem in magnetism, surface integral of magnetic field intensity over a surface (closed or open) is always:

  • -1
  • 1
  • 0
  • infinity
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