CBSE  /  Class 12  /  Physics  /  Electric Charges and Fields

  • 1. 
    Coulomb's law in vector form can be written as \(\vec{F}\) = (\(\frac{1}{4πε_n}\)) (\(\frac{q_1q_2}{r^2}\))\(\vec{r}\) where ε0 is the permitivity of free space. The SI units of ε0 will be:

  • N-1m-2C-2
  • Nm-2C2
  • N-1m-2C9.
  • Nm-2C2

  • 2. 
    The dimensional representation of cu will be :

  • [MLT4 A2]
  • [M-1L-3T4A2]
  • [ML-2T ]
  • None of these

  • 3. 
    When placed in a uniform field, a dipole experiences:

  • a net force
  • a torque
  • both a net force and torque
  • neither a net force nor a torque

  • 4. 
    A parrot comes and sits on a bare high power line. It will:

  • experience a mild shock '
  • experience a strong shock.
  • get killed instantaneously
  • not be affected practically

  • 5. 
    The SI units of electric dipole moment are:

  • C
  • Cm-1
  • Cm
  • Nm-1

  • 6. 
    If two conducting sphere are connected after charging separately then:

  • Electrostatic energy sphere energy will remain conserved
  • Electrostatic energy charges remains conserved
  • Electrostatic energy energy and charge remains conserved
  • None

  • 7. 
    A soap bubble is given a negative charge, then its radius:

  • increases
  • decreases
  • remains unchanged
  • may increase or decrease

  • 8. 
    In non-uniform electric field, electric dipole experiences:

  • torque only
  • torque as well as net force
  • force only
  • None of these

  • 9. 
    An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :

  • 1.6 ms-2
  • 1.6 × 1018ms-2
  • 3.2 × 1018ms-2
  • 0.8 × 1018 ms-2

  • 10. 
    A semicircular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at the centre is:

  • \(\frac{λ}{2λε_0r^2}\)
  • \(\frac{λ}{4πε_0r}\)
  • \(\frac{λ^2}{2πε_0r}\)
  • \(\frac{λ}{2πε_0r}\)
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