Electrostatic P...

A positive point charge q is carried from a point B to a point A in the electric field of a point charge $$+$$Q held at O. If the permittivity of free space is $$\epsilon_0$$ and OA=a and OB=b, the work done in the process is given by :

Two capacitors when connected in series have a capacitance of $$3\mu F$$, and when connected in parallel have a capacitance of $$16\mu F$$. Their individual capacities are :

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor :

From a supply of identical capacitors rated $$8 mF, 250 V$$, the minimum number of capacitors required to form a composite $$16mF, 1000V$$ is :

If a slab of insulating material $$4\times 10^{-5}m$$ thick is introduced between the plates of a parallel plate capacitor, the distance between the plates has to be increased by $$3.5\times 10^{-5}m$$ to restore the capacity to original value. Then the dielectric constant of the material of slab is :

An air capacitor C connected to a battery of e.m.f. V acquires a charge q and energy E. The capacitor is disconnected from the battery and a dielectric slab is placed between the plates. Which of the following statements is correct?

A capacitor becomes a perfect insulator for

The electric potential inside a conductor:

An electrical charge $$2 \times 10^{-8}$$ C is placed at the point (1, 2, 4 )m. At the point (4, 2, 0) m, the electric

If we increase '$$d$$' of a parallel condenser to '$$2d$$' and fill wax to the whole empty space between its two plate, then capacitance increase from $$1pF$$ to $$2pF$$. What is the dielectric constant of wax?