Lecture03

# Lecture03 - 1 Lecture 3 Chapter 14 Matter& Electric...

This preview shows pages 1–3. Sign up to view the full content.

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: 1 Lecture 3 Chapter 14. Matter & Electric Fields * Charged Particles * Electric Interactions between Charged Objects * Interaction of Charge & Neutral Matter Last Class: Dipole Moment Previously….Electric Fields E = 1 4 πε q 1 r 2 ˆ r Point charge: Dipole: for r>>s : E = 1 4 πε 2 qs r 3 ,0,0 at <r,0,0> E = − 1 4 πε qs r 3 ,0,0 at <0,r,0> +q-q s x y z at <0,0,r> E = − 1 4 πε qs r 3 ,0,0 Dipole moment: Uniformly charged sphere: r r Q E sphere ˆ 4 1 2 πε = for r>R (outside) = sphere E for r<R (inside) p = q s Matter 1/18/11 4 Bohr Model Quantum Physics 2 Hydrogen atom: 1 proton, 1 electron If a Sodium atom (Na) loses an electron: Ordinary matter is electrically neutral. However, matter can be charged by adding/removing charged particles Net Charge Sodium atom: Sodium ion (Na + ): net charge = (+e) + (-e) = 0 http://static.howstuffworks.com/gif/ atom-quantum.jpg Conservation of Charge The net electric charge is conserved in any physical process. Charge can be transferred from one object to another. Annihilation : e + + e − = γ + γ The net charge of a system plus its surroundings cannot change. http://svs.gsfc.nasa.gov/vis/a000000/a000100/a000182/a000182.mpg Pair production How a solid object becomes charged DEMO Plastic rod gets negatively charged when rubbed with fur....
View Full Document

{[ snackBarMessage ]}

### Page1 / 7

Lecture03 - 1 Lecture 3 Chapter 14 Matter& Electric...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online