Electrostatics ...

Charge on α–particle is

Two small conducting spheres of equal radius have charges +10 µC and – 20 µC respectively and placed at a distance R from each other experience force F₁. If they are brought in contact and separated to the same distance, they experience force F₂ The ratio F₁ to F₂ is

Two charges each equal to 2 µC are 0.5m apart. If both of them exist inside vacuum, then the force betweenthem is

A solid conducting sphere of radius a has a net positive charge 2Q conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge –Q. The surface charge density on the inner and outer surfaces of the spherical shell will be

Three charges each of magnitude q are placed at the corners of an equilateral triangle, the electrostatic force on the charge placed at the center is (each side of triangle is L)

Three charges are placed at the vertices of an equilateral triangle of side \'a\' as shown in the following figure. The force experienced by the charge placed atthe vertex A in a direction normal to BC is

A body has –80 micro coulomb of charge. Number ofadditional electrons in it will be

Two point charges placed at a certain distance r in air exert a force F on each other. Then the distance r\' at which these charges will exert the same force in a medium of dielectric constant k is given by

Dielectric constant for metal is