| Direction: Q.16 to Q.20 |
| When an insulator is placed in an external field, the dipoles become aligned. Induced surface charges on the insulator establish a polarization field \[{{\overrightarrow{E}}_{i}}\] in its interior. |
| The net field \[\overrightarrow{E}\]in the insulator is the vector sum of \[{{\overrightarrow{E}}_{0}}\] and \[{{\overrightarrow{E}}_{i}}\]as shown in the figure. |
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| On the application of external electric field, the effect of aligning the electric dipoles in the insulator is called polarisation and the field \[{{\overrightarrow{E}}_{i}}\] is known as the polarization field. |
| The dipole moment per unit volume of the dielectric is known as polarisation \[\left( \overrightarrow{P} \right)\]. |
| For linear isotropic dielectrics, \[\overrightarrow{P}=\chi \overrightarrow{E}\], where \[\chi \] = electrical susceptibility of the dielectric medium. |
| Read the given passage carefully and give the answer of the following questions. |
A) \[{{O}_{2}}\]
B) \[{{H}_{2}}\]
C) \[{{N}_{2}}\]
D) \[HCl\]
Correct Answer: D
Solution :
(d) \[HCl\] In polar molecule the centres of positive and negative charges are separated even when there is no external field. Such molecule have a permanent dipole moment. Ionic molecule like HCl is an example of polar molecule.
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