R.M.D. Engineering College

Kavaraipettai – 601 206

Academic Year : 2012-2013 Subject Name : Engineering Physics-II

Semester : II Subject Code : PH 2161

Section : ECE (A) & E&I(C)

Part- A

1. What are dielectrics?

2. Whether all dielectric are insulators and vice-versa.

3. Define Polarisation Vector & Electric Flux Density.

4. Define dielectric constant of a material.

5. What is meant by electric susceptibility?

6. Difference between polar and non-polar molecules.

7. What is meant by orientation polarization?

8. What is space charge polarization?

9. List out the frequency dependence of polarization.

10. What is meant by internal field in dielectrics?

11. Write a note on Clausius-Mosotti relation.

12. What is dielectric breakdown?

13. Mention various types of dielectric breakdown mechanisms.

14. Define dielectric loss.

15. Write any four applications of dielectric materials.

Part– B

1. a) What is meant by polarisation in dielectrics?

b) What are the different types? Briefly explain.

c) What is internal field in a solid dielectrics?

d) Obtain Clausius-Mosotti equation and show how it is used to determine the

dipole

moment of a polar molecule

2. Explain the different types of polarisation mechanism in dielectric. What is meant

by local field? Derive clausius-Mosotti equation.

3. a) Derive an expression for internal field in dielectrics.

b) Explain ionic and orientational polarization.

Unit - 4 Dielectric Materials

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