Physics Electrostatics Test Online MCQs

1. A 40 μF capacitor in a defibrillator is charged to 3000 V. The energy stored in the capacitor is set through the patient during a pulse of duration 2 ms. The power delivered to the patient is:

2. A parallel plate air capacitor has a capacitance C. When it is half filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be

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

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

5. Minimum number of 8μF and 250 V capacitors are used to make a combination of 16μF and 100 V are:

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

7. 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:

8. Shown below is a distribution of charges. The flux of electric field due to these charges through the surfaces S is:

9. 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:

10. 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:

11. How many electrons make up a charge of 20μC.

12. An electron of mass m and charge e is accelerated from rest through a potential difference v in vacuum. The final speed will be:

13. The electric filed at a distance r from the center in the space between two concentric metallic spherical shells of radii r₁ and r₂ carrying charge Q₁ and Q₂ is (r₁ < r < r₂)

14. Two parallel large thin metal sheets have equal surface charge densities (σ = 26.4 x 10⁻¹² c/m²) of opposite signs. The electric field between these sheets is:

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