# Archive for August, 2010

Basic Statistics

## Skin Effect

If earth is a big magnet, then why does not all the iron stick to it?

## skin effect

skin effect is ac flows on the surface of conductor or upto a certain depth.

but why so?  flow of current is due to movement or moment of electron… is there no free electron in bulk of conductor,  if no then why ,  if yes then why ac can’t flow there and what about dc , can it flow in bulk of conductor..

what is the difference in flow of electron in ac and dc

## Assignment-I (b)

Assignment-I (b)

Electrostatics and Electrodynamics

1. Write Maxwell’s equations both in integral and differential forms. Also give their physical significance.
2. What is Equation of continuity? Explain. How could Maxwell correct and present Ampere’s law in its generalized form?
3. Using Ampere law obtain an expression for the magnetic field due to a current carrying straight conductor of infinite length.
4. State Gauss theorem. Derive the differential form of Gauss Theorem.
5. Show that Coulomb’s Law can be deduced from Gauss Law.
6. Using Gauss Theorem calculate the electric field due to a uniformly charged non conducting solid sphere at a point (i) Outside the sphere (ii) On the surface of sphere (iii) Inside the sphere.
7. Show that the Electric field is conservative and Prove curl E =0.
8. Given A=y2x i + (y-x) k , find divergence and curl of A.