There are two metallic plates of a parallel plate capacitor. One plate is given a charge $+q$ while the other is earthed as shown. Points $P, P_1$ and $P_2$ are taken as shown in the adjoining figure. Then the electric intensity is not zero at:

 

The distance between the plates of a circular parallel plate capacitor of diameter, $40 \mathrm{mm}$, whose capacity is equal to that of a metallic sphere of radius, $1 \mathrm{m}$ will be:

The energy density in a parallel plate capacitor is given as $2.1 \times {10}^{-9} \mathrm{J} {\mathrm{m}}^{-3}$. The value of the electric field in the region between the plates is :

A glass slab is put within the plates of a charged parallel plate condenser. Which of the following quantities does not change?

A parallel plate capacitor is connected with a battery whose potential difference remains constant. If the plates of the capacitor are shifted apart then the intensity of electric field:

A parallel plate air capacitor has a capacitance $C$. When it is half-filled with a dielectric of dielectric constant $5$, the percentage increase in the capacitance will be:-

The equivalent capacitance between the points $A$ and $B$ in the given diagram is :

In an adjoining figure, three capacitors $C_1, C_2$and $C_3$ are joined to a battery. The correct condition will be: