CBSE  /  Class 12  /  Physics  /  Electric Charges and Fields

  • 1. 
    Which one of the following is the unit of electric field?

  • Coulomb
  • Newton
  • Volt
  • N/C

  • 2. 
    Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :

  • +3q
  • +2q
  • -3q
  • -4q

  • 3. 
    If an electric dipole is kept in a uniform electric field then resultant electric force on it is :

  • always zero
  • never zero
  • depend upon capacity of dipole
  • None

  • 4. 
    The number of electron-taken out from a body to produce 1 coulomb of charge will be :

  • 6.25 × 1018
  • 625 × 1018
  • 6.023 × 1023
  • None

  • 5. 
    The work done in rotating an electric dipole in an electric field:

  • W = ME (1 - cos θ)
  • W = ME tan θ
  • W = ME sec θ
  • None

  • 6. 
    If sphere of bad conductor is given charge then it is distributed on:

  • surface
  • inside the surface
  • only inside the surface
  • None

  • 7. 
    Electric field in a cavity of metal:

  • depends upon the surroundings
  • depends upon the size of cavity
  • is always zero
  • is not necessarily zero

  • 8. 
    The dielectric constant of a metal is:

  • 0
  • 1
  • ∞
  • -1

  • 9. 
    1 coulomb is equal to:

  • 3 × 109 e.s.u.
  • \(\frac{1}{3}\) × 109 e.s.u.
  • 3 × 1010 e.s.u.
  • \(\frac{1}{3}\) × 1010 e.s.u.

  • 10. 
    Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :

  • 1
  • 4
  • \(\frac{1}{16}\)
  • 16
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