Dielectrics and Polarisation

Which of the following waves can be polarized (i) Heat waves (ii) Sound waves? Give reason to support your answer.

Explain briefly, using a proper diagram, the difference in the behavior of a conductor and a dielectric in the presence of an external electric field.

Two metal plates having charges Q, −Q face each other at some separation and are dipped into an oil tank. If the oil is pumped out, the electric field between the plates will

Define the term polarization of a dielectric and write the expression for a linear isotropic dielectric in  terms of electric field.

A parallel-plate capacitor having plate area 400 cm² and separation between the plates 1⋅0 mm is connected to a power supply of 100 V. A dielectric slab of thickness 0⋅5 mm and dielectric constant 5⋅0 is inserted into the gap. (a) Find the increase in electrostatic energy. (b) If the power supply is now disconnected and the dielectric slab is taken out, find the further increase in energy. (c) Why does the energy increase in inserting the slab as well as in taking it out?

A dielectric slab is inserted between the plates of an isolated charged capacitor. Which of the following quantities will remain the same?

The voltage rating of a parallel plate capacitor is 500V. Its dielectric can withstand a maximum electric field of 10⁶ V/m. The plate area is 10^-4 m². What is the dielectric constant if the capacitance is 15 pF?

(given ε₀ = 8.86 × 10^-12 C²/Nm²)

A capacitor filled partially with dielectric material of dielectric constant 'k'. Its electric potential versus position graph is as shown. The distance between the two plates is 4 mm. The dielectric constant of the medium is ______.