Dielectric constant of pure water is 81. Its permittivity will be:
Two similar small sphere having +q and –q charge are kept at a certain distance. F force acts between the two. If in the middle of two sphere, another similar small sphere having +q charge is kept, then it will experience a force in magnitude and direction as:
Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are EA and EB respectively and if the distance between A and B is r, then
ABC is an equilateral triangle. Charges +q are placed at each corner. The electric intensity at O will be:
The figure show some of the electric field lines corresponding to an electric field. The figure suggest:
If a charged spherical conductor of radius 10 cm has potential V at point distant 5 cm from its center, then the potential at a point distant 15 cm from the center will be: