Practice Test

1) The electric dipole potential falls off at a large distance as

2) In the above case consider
(i) The signs of the work done by the field in moving a small positive charge from Q to P.
(ii) The sings of the change in the kinetic energy of a small negative charge in going from B to A. The signs are :

3) The work required to put together this arrangement is

4) The ratio of electric potential due to an electric dipole in the end on position to that in the broad side on position for the same distance from it, is

5) A closed surface encloses an electric dipole. The total electric flux over this closed surface is

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

7) The electric potential at a point on the axis of an electric dipole depends on the distance x of the point from the mid-point of the dipole as

8) A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself

9) A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at a distance of 2 cm from the centre of the sphere is

10) Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 0.10 m surrounding the total charge is 1.5 V m. The flux over a concentric sphere of radius 0.15 m will be

11) Statement 1 : Two concentric charged spherical shells are given. The potential difference between the shells depends on charge of inner shell.
Statement 2 : Potential due to charge of outer shell remains same at every point inside the sphere.

12) A metallic shell has a point charge 'q' kept inside its cavity. Which one of the following diagrams correctly represents the electric lines of forces?

13) Twenty seven drops of water of the same size are equally and similarly charged. They are then united to form a bigger drop. By what factor will the electric potential change?

14) A 5 C charge experiences a force of 2000 N when moved between two points separated by a distance of 2 cm in a uniform electric field. The potential difference between the two points is

15) Statement 1 : Potential at the surface of a solid metallic sphere may be non-zero, even if net charge on the surface is zero.
Statement 2 : If potential at the centre of a solid metallic spehre is non-zero, potential at the surface of the sphere is non-zero.

16) Statement 1 : Potential energy of a system of point charges may be zero.
Statement 2 : Potential energy of individual point charges in a system of point charges may be zero.

17) What is the net outward flux through each flat face?

18) What is the net outward flux through the cylinder?

19) What is the net charge inside the cylinder?