Physics Electrostatics Test Online MCQs

1. Two infinitely long parallel conducting plates having surface charge densities +σ and –σ respectively, are separated by a small distance. The medium between respectively, are separated by a small distance. The medium between the plates is vacuum. If  ε₀ is the dielectric permittivity of vacuum then the electric field in the region between the plates is:

2. Five capacitors, each of capacitance value C are connected as shown in the figure. The ratio of capacitance between P & R, and the capacitance between P & Q is:

3. Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are:

4. A hollow cylinder has charge q C within it. If ф is the electric flux in unit of voltmeter associated with the curved surface B, the flux linked with the plane surface A in unit of voltmeter will be:

5. Charge q is uniformly distributed over a thin half ring of radius R. The electric field at the center of the ring is

6. The number of electrons for one coulomb of charge are:

7. An electric dipole placed in a non-uniform electric field experiences:

8. Three charges are placed at the vertices of an equilateral triangle of side ‘a’ as shown in the following figure. The force experienced by the charge placed at the vertex A in a direction normal to BC is:

9. A condenser of capacitor 50μF is charged to 10 volt. The energy stored is:

10. A conducting sphere of radius 10 cm is charged with 10μC. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are separated, then surface density if charges on the spheres will be in the ratio of

11. The spatial distribution of the electric field due to two charges (A, B) is shown in figure. Which one of the following statements is correct?

12. An insulated charged sphere of radius 5 cm gas a potential of 10 V at the surface. The potential at the center will be:

13. A circle of radius R is drawn with charge + q at the center. A charge q₀ is brought from point B to C, then work done is

14. Three point charges +q, -2q and + q are placed at point (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

15. A body can be negatively charged by: