CBSE  /  Class 12  /  Physics  /  Electric Charges and Fields

  • 1. 
    When a dipole of moment \(\vec{p}\) is placed in uniform electric field \(\vec{E}\), then the torque acting on the dipole is:

  • \(\vec{τ}\) = \(\vec{p}\).\(\vec{E}\)
  • \(\vec{τ}\) = \(\vec{P}\) + \(\vec{E}\)
  • \(\vec{τ}\) = \(\vec{p}\) + \(\vec{E}\)
  • \(\vec{τ}\) = \(\vec{p}\) - \(\vec{E}\)

  • 2. 
    Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :

  • 4L
  • 8L
  • L/4
  • 2L

  • 3. 
    The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :

  • straight line
  • parabola
  • hyperbola
  • None of these

  • 4. 
    Corona discharge takes place:

  • at the surface of a conductor
  • near the sharp points of a conductor
  • outside the conductor
  • at the centre of the conductor

  • 5. 
    The belt of a Vande Graaf generator gets charge by :

  • corona discharge
  • induction
  • electrification
  • None of these

  • 6. 
    Quantisation of charge implies:

  • Charge does not exist
  • Charge exists on particles
  • There is a minimum permissible magnitude of charge
  • Charge can't be created

  • 7. 
    The conservation of electric charge implies that:

  • Charge can't be created
  • Charge can't be destroyed
  • The number of charged particle in the universe is constant
  • Simultaneous creation of equal and opposite charges is permissible

  • 8. 
    The number of electrons contained in one coulomb of charge is:

  • 6.25 × 1018
  • 6.25 × 1017
  • 6.25 × 1019
  • 1.6 × 1019

  • 9. 
    The unit of intensity of electric field is :

  • metre/volt
  • Joule/newton
  • Coulomb/newton
  • Newton/coulomb

  • 10. 
    1 V equals to:

  • 1 J
  • 1 JC-1
  • 1 CJ-1
  • 1 JC
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