Dielectrics - Practice Questions & MCQ

When the air in a capacitor is replaced by a medium of dielectric constant K, the capacity,

In the absence of an applied electric field in non-polar materials, that possess non-zero net dipole moment, the electric polarization vector in this

. As shown in the figure, a very thin sheet of aluminium is placed in between the plates of the condenser. Then the capacity

In the absence of an applied electric field in nonpolar dielectric materials, charges are arranged in such a way that

In polar materials, dipole moment of all dipoles in the absence of electric field is

The dielectric constant k  of an insulator cannot be :

Choose the correct statement:

With the rise in temperature, the dielectric constant $K$ of a liquid

A capacitor has air as a dielectric medium and two conducting plates of area $12 \mathrm{~cm}^2$ and they are $0.6 \mathrm{~cm}$ apart. When a slab of dielectric having area $12 \mathrm{~cm}^2$ and $0.6 \mathrm{~cm}$ thickness is inserted between the plates, one of the conducting plates has to be moved by $0.2 \mathrm{~cm}$ to keep the capacitance same as in the previous case. The dielectric constant of the slab is : $\left(\right.$ Given $\left.\epsilon_0=8.834 \times 10^{-12} \mathrm{~F} / \mathrm{m}\right)$

Direction :   In the following question, a statement of Assertion ( A ) is followed by a statement of reason (R). Mark the correct choice as 

Assertion : When a dielectric medium is inserted between the plates of an isolated charged capacitor, the charge on the capacitor will remain the same . 

Reason : Charge on a isolated system is conserved .