Explain polarization of nonpolar molecule in uniform electric field and define the linear isotropic dielectrics.

Explanation

As shown in figure, in an external electric field the positive and negative charges of a non-polar molecule are displaced in opposite directions.

The displacement stops when the external force on the constituent charges of the molecule is balanced by the restoring force (due to internal fields in the molecule).
The non-polar molecule thus develops a induced dipole moment is in the direction the field.
Linear Isotropic dielectrics : ,.In an extemi electric field when the induced dipole moment i in the direction of the field and is proportional tc the field strength" substances for which thi assumption is true are called linear isotropi, dielectrics.
The induced dipole moments of differen molecules add up giving a net dipole moment o the dielectric in the presence of the extema field.