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?

Two metallic sphers of radii 1 cm and 2 cm are given charges 10^-2C and 5xx10^-2 C respectively. If they are connected by a conducting wire, the final charge on the smaller sphere is

A spherical conducting shell of inner radius r_1 and outer radius r_2 has a charge Q as shown in the figure. Is the electric field isnide a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape? Explain.

Two charged conducting spheres A and B having radii a and b connected to each other by a copper wire. Find the ratio of the electric fields at the surfaces of the two spheres.

Two point charges q_1 and q_2 are kept at a distance of r_(12) in air. Deduce the expression for the electrostatic potential energy of the system.

Two point charges q_A = 3 muC and q_B = -3 muC are located 20 cm apart in vacuum. What is the electric field at the midpoint O of the line AB joining the two charges?

Two charged spherical conductors of radii R_1 and R_2 when connected by a conducting wire acquire cahrges q_1 and q_2 respectively. Find the ratio of their surface charge ensities in terms of their radii.

If q_1q_2>0 , what is the nature of force between the two charges?

Two point charges 4Q and Q are separated by a distance of 1 m in air. At what point on the line joining the two charges is the electric field intensity zero?

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.