question_answer

Direction: Q.36 to Q.40

A dielectric slab is a substance which does not allow the flow of charges through it but permits them to exert electrostatic forces on one another.

When a dielectric slab is placed between the plates, the field \[{{E}_{0}}\]polarises the dielectric. This induce charge \[-{{Q}_{P}}\]on the upper surface are \[+{{Q}_{P}}\]on the lower surface of the dielectric. These induced charges set up a field \[{{E}_{P}}\]inside the dielectric in the opposite direction of \[{{\overrightarrow{E}}_{0}}\] as shown.

Read the given passage carefully and give the answer of the following questions.

In a parallel plate capacitor, the capacitance increases from \[4\mu F\] to \[80\mu F\], on introducing a dielectric medium between the plates. What is the dielectric constant of the medium?

A) 10                                

B) 20

C) 50                                

D) 100