Two metal spheres, one of radius R and the other of radius 2R, both have the same surface charge density s. They are brought in contact and separated. What will be new surface charge densities on them?

What is the SI unit of surface charge density ?

A spherical conducting shell of inner radius r_1 and outer radius r_2 has a charge Q as shown in the figure. A charge q is placed at the centre of the shell. What is the surface charge density of the inner and outer sufaces of the shell?

Fill ups A point charge is placed at the centre of a hollow conducting sphere of internal radius 'r' and outer radius '2r'. The ratio of the surface charge density of the inner surface to that the outer surface will be…………….. .

Two isolated metallic solid spheres of radii R and 2R are charged, such that both of these have same charge density. The spheres are located far away from each other and connected by a thin conducting wire. Find the new charge density on the bigger sphere.

A spherical conducting shell of inner radius r_1 and outer radius r_2 has a charge Q. A charge q is placed at the centre of the shell. What is the surface charge density on the inner and outer surfaces of the shell?

A sphere of charge of radius R has uniform volume charge density. The electric field due to the sphere of charge at a point

Consider two conducting spheres of radii of R_1 and R_2 with R_1 > R_2 . If the two are at the same potential the larger sphere has more charge than the smaller spheres. State whether the charge density of the smaller sphere is more or less than that of the larger one.

A solid metal sphere of radius r has charge +Q. The sphere has radius 36 cm This charge is one the surface of the sphere but it may be considered to be a point charge at its centre. A spark suddenly connects the metal sphere in to the earth, causing the potnetial of the sphere to be reduced from 7.0 xx 10^5V to 2.5 xx 10^5V . Calculate the energy dissipated in the spark.

A ball of charge q is plaed in a hollow conductive uncharged sphere. After this, the sphere is connected with earth for a short time and the ball is then removed from the sphere. The ball has not been brought into contact with the sphere. What charge will the sphere have after these operations? Where and how will this charge the distributed?

A conducting sphere S_1 of radius r is attached to an insulating handle. Another conduction sphere S_2 of radius R is mounted on an insulating stand. S_2 is initially uncharged. S_1 is given a charge Q brought into contact with S_2 and removed. S_1 is recharge such that the charge on it is again Q and it is again brought into contact with S_2 and removed. This procedure is repeated n times. Find the electrostatic energy of S_2 after n such contacts with S_1 .