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12th Physics - Electrostatics Model Question Paper 1 8682895000 Jan-06 , 2020

Electrostatics

12th Physics - Electrostatics Model Question Paper 1

Electrostatics Model Question Paper 1

12th Standard

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Physics

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. An electric dipole is placed at an alignment angle of 30o with an electric field of 2 x 105 NC-1. It experiences a torque equal to 8 N m. The 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. Two identical conducting balls having positive charges q1 and q2 are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.

    (a)

    less than before

    (b)

    same as before

    (c)

    more than before

    (d)

    zero

  3. Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is _______.

    (a)

    8.80 x 10-17 J

    (b)

    -8.80 x 10-17 J

    (c)

    4.40 x 10-17 J

    (d)

    5.80 x 10-17 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. 5 x 2 = 10

  5. What is an equipotential surface?

  6. What is meant by dielectric breakdown?

  7. A sphere of charge +Q is fixed. A smaller sphere of charge +q is placed near the larger sphere and released from rest. The small sphere will move away from large sphere with
    a. decreasing velocity & decreasing acceleration.
    b. decreasing velocity & increasing acceleration.
    c. decreasing velocity & constant acceleration
    d. increasing velocity & decreasing acceleration
    e. increasing velocity & increasing acceleration
    Which of the above statement is correct? Explain.

  8. What is the work zone by the field in moving a small positive charge from A to P? Given reason.

    9. 5 x 3 = 15

  9. 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.

  10. How do we determine the electric field due to a continuous charge distribution? Explain.

  11. Calculate the electric field due to a dipole on its axial line and equatorial plane.

  12. Deduce electric flus for closed surfaces.

  13. Define and derive an expression for the energy density in parallel plate capacitor.

    14. 4 x 5 = 20

  14. Four charges are arranged at the corners of the square PQRS of side an as shown in the figure.
    (a) Find the work required to assemble these charges in the given configuration.
    (b) Suppose a charge q is brought to the center of the square, by keeping the four charges fixed at the corners, how much extra work is required for this?

  15. A polythene piece rubbed with wool is found to have a negative charge of 3 x 10-7 C. Estimate the number of electrons transferred from which to which?

  16. An infinite number of charges each equal to q are placed along X-axis at x = 1, x = 2, x = 3, x = 4, x = 8 and soon. Find the electric field at the point x = 0 due to this set up of charges.

  17. In the circuit shown in figure. Find
    (i) The equivalent capacitance and
    (ii) The charge stored in each capacitor

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