12 - Physics - Unit 1 - Electro Statics

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12 - Physics - Unit 1 - Electro Statics

Prepared by Mr. P. ILAIYARAJA M. Sc. ,B. Ed. , PG ASST IN PHYSICS , GHSS, PANCHANATHIKKULAM EAST, NAGAI DT.   ; & www. Padasalai. Net


Questions and Answers
  • 1. 
    The electrostatic force between two point charges kept at a distance d apart, in a medium εr = 6, is 0.3 N. The force between them at the same separation in vacuum is
    • A. 

      1.8 N

    • B. 

      0.5 N

    • C. 

      20 N

    • D. 

      2 N

  • 2. 
    Elecric field intensity is 400 V m1 at a distance of 2 m from a point charge. It will be 100 V m1 at a distance?
    • A. 

      4 m

    • B. 

      4 cm

    • C. 

      1.5 m

    • D. 

      50 cm

  • 3. 
    Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them the electric field is zero?
    • A. 

      20 cm from the charge 4q

    • B. 

      15 cm from the charge q

    • C. 

      7.5 cm from the charge q

    • D. 

      5 cm from the charge q

  • 4. 
    A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences
    • A. 

      Neither a net force nor a torque

    • B. 

      Only a torque

    • C. 

      Both a net force and torque

    • D. 

      Only a net force

  • 5. 
    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

  • 6. 
    Which of the following quantities is scalar?
    • A. 

      Electric potential

    • B. 

      Electric force

    • C. 

      Electric field

    • D. 

      Dipole moment

  • 7. 
    The capacitance of a parallel plate capacitor increases from 5 μf to 60 μf when a dielectric is filled between the plates. The dielectric constant of the dielectric is
    • A. 

      12

    • B. 

      55

    • C. 

      65

    • D. 

      10

  • 8. 
    A hollow metal ball carrying an electric charge produces no electric field at points
    • A. 

      Inside the sphere

    • B. 

      On its surface

    • C. 

      Outside the sphere

    • D. 

      At a distance more than twice

  • 9. 
    A glass rod rubbed with silk acquires a charge of  . The number of electrons it has gained or lost (1) (gained)                                   (2) (lost) (3) (lost)                                        (4) (lost)
    • A. 

      (2)

    • B. 

      (1)

    • C. 

      (4)

    • D. 

      (3)

  • 10. 
    If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to (1)        (2)            (3)                (4)
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 11. 
    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 center O of the square is (1)     (2)         (3)            (4) zero
    • A. 

      (4)

    • B. 

      (3)

    • C. 

      (2)

    • D. 

      (1)

  • 12. 
    Electric potential energy (U) of two point charges is (1)            (2)        (3) pE cos θ            (4) pE sin θ
    • A. 

      (2)

    • B. 

      (3)

    • C. 

      (1)

    • D. 

      (4)

  • 13. 
    The unit of permittivity is  (1) C2 N1 m2                    (2) N m2 C2       (3) H m1           (4) N C2 m2
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 14. 
    The number of electric lines of force originating from a charge of 1 C is (1)     (2)    (3)      (4)
    • A. 

      (1)

    • B. 

      (2)

    • C. 

      (3)

    • D. 

      (4)

  • 15. 
    The electric field outside the plates of two oppositely charged plane sheets of charge density σ is (1)        (2)            (3)            (4) zero
    • A. 

      (4)

    • B. 

      (3)

    • C. 

      (2)

    • D. 

      (1)

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