Electrostatics One Mark Questions

12th Standard EM

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Physics

Time : 00:30:00 Hrs
Total Marks : 10
    5 x 1 = 5
  1. An electric dipole is placed at an alignment angle of 300 with an electric fi eld of 2 × 105 NC-1. It experiences a torque equal to 8 N m. Th e charge on the dipole if the dipole length is 1 cm is

    (a)

    4 mC

    (b)

    8 mC

    (c)

    5 mC

    (d)

    7 mC

  2. The total electric fl ux for the following closed surface which is kept inside water

    (a)

    \(\frac { 80q }{ { \varepsilon }_{ 0 } } \)

    (b)

    \(\frac { q }{ { 40\varepsilon }_{ 0 } } \)

    (c)

    \(\frac { q }{ { 80\varepsilon }_{ 0 } } \)

    (d)

    \(\frac { q }{ { 160\varepsilon }_{ 0 } } \)

  3. An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is:

    (a)

    10 J

    (b)

    -20 J

    (c)

    +20 J

    (d)

    -10 J

  4. The value of constant 'K' in coulomb law is

    (a)

    0.9 x 109 Nm2 C2

    (b)

    9 x 10-9 Nm2C2

    (c)

    9 x 109 Nm-2 C-2

    (d)

    9 x 109 Nm2 C-2

  5. The electrostatic force is always greater in magnitude than gravitational force for_________ object.

    (a)

    bigger size

    (b)

    smaller size

    (c)

    medium size

    (d)

    all the above

  6. 5 x 1 = 5
  7. Air

  8. (1)

    Faraday cage

  9. Dielectric

  10. (2)

    8.854 x 10-12 C2N-1m-2

  11. Electrostatic shielding

  12. (3)

    Insulator

  13. Electrostatic Induction

  14. (4)

    εr= 1

  15. permittivity of free space

  16. (5)

    Van de graaff generator

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