Physics Test: Important Practice Questions On Electrostatics!

10 Questions | Total Attempts: 846

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Physics Test: Important Practice Questions On Electrostatics!

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Questions and Answers
  • 1. 
    A glass rod rubbed with silk acquires a charge of +8 x 10-12C. The number of electrons it has gained or lost
    • A. 

      5 x 10-7(gained)

    • B. 

      5 x 107(lost)

    • C. 

      2 x 10-8(lost)

    • D. 

      -8 x 10-12(lost)

  • 2. 
    The electrostatic force between two point charges kept at a distance  d apart , in a medium εr =6, is 0.3N. The force between them at the same separation in vacuum is
    • A. 

      20 N

    • B. 

      0.5 N

    • C. 

      1.8 N

    • D. 

      2 N

  • 3. 
    Electric field intensity is 400Vm-1 at a distance of 2m from a point charge.It will be 100Vm-1 at a distance?
    • A. 

      50 cm

    • B. 

      4 cm

    • C. 

      4 m

    • D. 

      1.5 m

  • 4. 
    Two point charges +4q and +q are placed 30cm apart. At what point on the line joining them the electric field is zero?
    • A. 

      15 cm from the charge q

    • B. 

      7.5 cm from the charge q

    • C. 

      20 cm from the charge 4q

    • D. 

      5 cm from the charge q

  • 5. 
    A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences
    • A. 

      Only a net force

    • B. 

      Only a torque

    • C. 

      Both a net force and torque

    • D. 

      Neither a net force nor a torque

  • 6. 
    If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to 
    • A. 

      1/x2

    • B. 

      1/x3

    • C. 

      1/x4

    • D. 

      1/x3/2

  • 7. 
    Four charges +q, +q, -q and -q respectively are placed at the corners A,B,C and D of a square of side a. The electric potential at the centre O of the square is
    • A. 

      Q/4πεoa

    • B. 

      2q/4πεoa

    • C. 

      4q/4πεoa

    • D. 

      Zero

  • 8. 
    Electric potential energy (U) of two point charges is
    • A. 

      Q1q2/4πεor2

    • B. 

      Q1q2/4πεor

    • C. 

      PE cosθ

    • D. 

      PE sinθ

  • 9. 
    The work done in moving 500 μC charge between two points on equipotential surface is
    • A. 

      Zero

    • B. 

      Finite positive

    • C. 

      Finite negative

    • D. 

      Infinite

  • 10. 
    Which of the following quantities is scalar?
    • A. 

      Dipole moment

    • B. 

      Electric force

    • C. 

      Electric field

    • D. 

      Electric potential

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