Lec06-22009

# Lec06-22009 - cture 6 cture 6 1 Thin sheet of any charge...

This preview shows pages 1–6. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: cture 6- cture 6- 1 Thin sheet of any charge distribution ' R disk E E E + = + ur ur ur ' L disk E E E- = + ur ur ur Just to left of disk Just to right of disk \$ \$ ( ' ) ( ' ) 2 2 disk disk disk disk E E E E E E E n n σ σ ε ε σ ε +- +- ∆ = +- + =- =- - ÷ ÷ = ur ur ur ur ur ur ur tiny disk n E σ ε ∆ = cture 6- cture 6- 2 Charges and fields of a conductor • In electrostatic equilibrium, charges inside a conductor do not move. Thus, E = 0 everywhere in the interior of a conductor . • Since E = 0 inside, there are no net charges anywhere in the interior. Net charges can only be on the surface(s). The electric field must be perpendicular to the surface just outside a conductor, since, otherwise, there would be currents flowing along the surface. σ σ ε cture 6- cture 6- 3 Electrostatic Shielding (Continued) + + + + + + Add Q’ If you now add charge Q’ to the conductor and/or Q’’ on the outside of the conductor, the interior electric fields do not change. Q’’ If you move charge q in the cavity, the exterior electric fields and the extreior charge distribution are not affected. Conducting shell electrostatically shields its exterior from changes on the inside. q Conducting shell electrostatically shields its interior from changes on the outside, too. cture 6- cture 6- 4 READING QUIZ 1 IN WHAT DIRECTION CAN YOU MOVE A TEST CHARGE RELATIVE TO AN ELECTRIC FIELD SO THAT THE ELECTRIC POTENTIAL DOES NOT CHANGE? A| Move in the direction of the electric field lines. B| Move opposite to the direction of the electric field lines. C| Move from point A in the electric field to point B in in the electric field along an arbitrary path. D| Move relative to the electric field along a path which is everywhere perpendicular to the electric field. cture 6- cture 6- 5 Electric Potential Energy of a Charge in Electric Field • Coulomb force is conservative => Work done by the Coulomb force is path independent ....
View Full Document

## This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

### Page1 / 23

Lec06-22009 - cture 6 cture 6 1 Thin sheet of any charge...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online