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12th Standard English Medium Physics Subject Electrostatics Book Back 3 Mark Questions with Solution Part - II

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 15

    Part I

    5 x 3 = 15
  1. Calculate the number of electrons in one coulomb of negative charge.

  2. Consider two point charges q1 and q2 at rest as shown in the figure.

    They are separated by a distance of 1m. Calculate the force experienced by the two charges for the following cases:
    (a) q1 = +2μC and q2 = +3μC
    (b) q1 = +2μC and q2 = -3μC
    (c) q1= +2μC and q2 = -3μC kept in water (εr = 80)

  3. Two small-sized identical equally charged spheres, each having mass 1 g are hanging in equilibrium as shown in the figure. The length of each string is 10 cm and the angle θ is 30° with the vertical. Calculate the magnitude of the charge in each sphere. (Take g = 10 ms−2)

  4. Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 x 10–11 m. The magnitude of charges on the electron and proton are 1.6 x 10–19 C. Mass of the electron is me = 9.1 x 10–31 kg and mass of proton is mp = 1.6 x 10–27 kg.

  5. Consider four equal charges q1, q2, q3 and q4 = q = +1 μC located at four different points on a circle of radius 1m, as shown in the figure. Calculate the total force acting on the charge q1 due to all the other charges.

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