Physics Unit 6 Test

Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is

A charge Q placed at the centre of two charges + q and + q. the system is in equilibrium then net force experienced by Q.

Two positive point charges q₁=16.0μC and q₂ = 4.0 $$\mu$$  C are separated by a distance of 3.0 m, as shown in Fig. Find the spot on the line joining the two charges where electric field is zero.

Two conducting spheres of radius r1 and r2

are at the same potential. The ratio of their charges is:

For a set of oppositely charged, infinite parallel plates, what is true about the electric field inside and outside the plates?

Two protons A and B are placed is between the two plates of a parallel plate capacitor charged to a potential difference V as shown in figure. The force on two protons are F_A and F_B ; then

The dielectric constant of metals is        

The capacity of a parallel plate condenser is 5μF. When a glass plate is placed between the plates of the conductor, its potential becomes 1/8th of the original value. The value of dielectric constant will be

The diagram shows four pairs of large parallel conducting plates. The value of the electric potential is given for each plate. Rank the pairs according to the magnitude of the electric field between the plates, least to greatest.