Electrostatics ...

A condenser of capacity C is charged to a potential difference of V₁. The plates of the condenser are then connected to an ideal inductor of inductance L. The current through the inductor when the potential difference across the condenser reduces to V₂ is

There is an air filled 1pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increase to 2pF The dielectric constant of wax is

The capacity and the energy stored in a parallel plate condenser with air between its plates are respectively C₀ and W₀. If the air is replaced by glass (dielectric constant = 5) between the plates, the capacity of the plates and the energy stored in it will respectively be

Force of attraction between the plates of a parallel plate capacitor is

A capacitor of capacity C is connected with a battery of potential V in parallel. The distance between its plates is reduced to half at once, assuming that the charge remains the same. Then to charge the capacitance upto the potential V again, the energy given by the battery will be

N identical spherical drops charged to the same potential V are combined to form a big drop. The potential of the new drop will be

The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance

The plates of parallel plate capacitor are charged upto 100V. A 2mm thick plate is inserted between the plates. Then to maintain the same potential difference, the distance between the plates is increased by 1.6 mm. The dielectric constant of the plate is

Force acting upon a charged particle kept between the plates of a charged condenser is F. It one plate of the condenser is removed, then the force acting on the same particle will become

Two metallic charged spheres whose radii are 20 cm and 10 cm respectively, have each 150 micro-coulomb positive charge. The common potential after they are connected by a conducting wire is