Electrostatics MCQs
Practice questions
Electric Potential
You are given two concentric charged conducting spheres of radii R1 and R2 such that R1 > R2, having charges Q1 and Q2 respectively. Calculate E and V at point B whose distance from the centre is rB.
Eight equal charges q are placed at each corner of a cube of side a each. Work done in carrying a charge -q from its centre to infinity is:
The electric field intensity at a point at a distance 2 m from a charge q is 4N/C. Find the amount of work done (in joule) in bringing a charge of 1 coulomb from infinity to this point.
Which of the following systems of charges have zero electrostatic potential energy?
Figure shows three circular arcs, each of radius R and total charge as indicated. The net electric potential at the centre of curvature is:
+Q (120°) +3Q
(120°)
+2Q
Answer Key - Electric Potential
| Question | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Answer | 2 | 4 | 3 | 1 | 2 | 2 | 1 | 4 | 3 | 3 |
Electric Dipole
Two small electric dipoles, one of dipole moment p₁ at point A and the other of dipole moment p₂ at point B. The torque experienced by the dipole p₂ is:
For shown situation of two dipoles the nature of forces between them are:
The force of attraction between two co-axial dielectric dipoles whose centers are r meters apart varies with distance as:
A and B are two points on the axis and the perpendicular bisector respectively of an electric dipole. The field at A and B are EA and EB.
4 charges are placed each at a distance 'a' from origin. The dipole moment of configuration is:
Answer Key - Electric Dipole
| Question | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Answer | 1 | 2 | 4 | 3 | 1 | 1 | 3 | 3 | 2 | 2 |