Question
A slab $X$ is placed between the two parallel isolated charged plates as shown in the figure. If $E_p$ and $E_q$ denotes the intensity of electric field at$ P$ and $Q,$ then:
✓
Answer
There is no effect of the metal on the external electric field $($ thus $A$ is incorrect$)$ while the dielectric reduces the net electric field outside. The dielectric produces an electric field inside it due to the induced charges which is opposite to the external field. Thus $EQ$ is reduced and $B$ and $C$ are also incorrect.$($Note that $E_P$ is not the external field$).$ Now as the electric field inside the conductor is zero, the field $E_{p}$ is zero if $X$ is a metallic.
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