Physics - Capacitor Question with Solution | TestHub

When a dielectric is placed in an external electric field ${\vec{E}}_0$, the molecules of the dielectric get polarized.

This polarization induces an internal electric field ${\vec{E}}_p$ in a direction opposite to the external electric field.

The net electric field inside the dielectric is given by $\vec{E}={\vec{E}}_0-{\vec{E}}_p$.

Since the induced electric field opposes the external electric field, the net electric field inside the dielectric decreases.

Answer: decreases