A sphere `S_1` of radius `r_1` encloses a charge Q. If there is another concentric sphere `S_2` of the radius `r_2(r_2>r_1)` and there be no additional charges between `S_1 and S_2` find the ratio of electric flux through `S_1 and S_2`

Difference between S_N1 and S_N2 reaction ?

Two concentric spherical shells S_1 and S_2 enclose charge Q and 2Q as shown in the figure If air is inside the tow shells, what is the ratio of electric flux through S_1 and S_2 ?

S_1 and S_2 are two parallel concentric spheres enclosing charges Q and 2Q respectively as shown in the figure. what is the ratio of the electric flux through S_1 and S_2 ?

S_1 and S_2 are two hollow concentric spheres encloing charges Q and 2 Q respectively as shown in Fig What is the ratio of electric flux through S_1 and S_2 ?

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 .

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. What is the limiting value of this energy as n rarrinfty ?

A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge Q/2 is placed at its centre C and another charge +2Q outside the shell at a distance r from the centre as shown in figure. Find the electric flux through the shell.

Twenty seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the ratio of S and S'.

Two copper shperes of radii r_1 and r_2 having charges q_1 and q_2 are connected by means of a wire. What is the electrical condition that no charge flows between them?

A small sphere of radius r_1 and charge q_1 is enclosed by a spherical shell of radius r_2 and charge q_2 . Show that if q_1 is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge q_2 on the shell is.