In a liquid medium of dielectric constant `k_(1)` ,two small point charges (q , m) are suspended from a point in liquid by threads of equal length. The angle between them is `60^(@)` .In another medium of dielectric constant `k_(2)` ,the angle between them becomes `120^(@)` Then ratio `k_(1)/k_(2)` is

In a liquid medium of dielectric constant K and of specific gravity 2, two identically charged spheres are suspended from a fixed point by threads of equal lengths. The angle between them is 90^(@) . In another medium of unknown dielectric constant K^(1) , and specific gravity 4, the angle between them becomes 120^(@) . If density of material of spheres is 8gm/cc then find K^(1) .

Two point charges placed at a distance r in air experience a certain force. Then the distance at which they will experience the same force in a medium of dielectric constant K is

Two point charages placed at a distance r. in the air experiene a certain force. Then the distance at which they will experience the same force in the medium of dielectric constant K is

Two point charges placed at a distance r in air exert a force F on each other. The value of distance R at which they experience force 4F when placed in a medium of dielectric constant K = 16 is :

Two identical charged spheres of material density rho , suspended from the same point by inextensible strings of equal length make an angle theta between the string. When suspended in a liquid of density sigma the angle theta remains the same. The dielectric constant K of the liquid is

If a diaelectric material of dielectric constant epsilon_r is completely filled between two point charges as shown in the figure, then the net electrostatic force on q_1 is

Find the distance between the points (k, k+1, k+2) and (0, 1, 2).

Two charge spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant K=2, then the force (if all conditions are same) is

Two charge spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant K=2, then the force (if all conditions are same) is

Suppose the space between the two inner shells of the previous problum is filled with a dielectric constant . K. Find the capacitance of the system between A and B.