Lecture-6-01-31-08 - Lecture-6 Materials in Electric Field...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Reorientation Lecture-6 Materials in Electric Field Conductors Metals, liquids and plasmas Charges are free to move inside In E -field, charges separate, producing induced electric field Induced field cancels applied field in metal E -field is normal to metallic surface Insulators (Dielectrics) Oxides, polymers Charges are bound to atoms in lattice. In E -field, a) atoms gain dipole moments by polarization; and b) permanent dipoles reorient by E -field. In E -field, charges separate due to Coulomb force, and opposite surfaces accumulate opposite charges, producing induced E -field . Induced E -field opposes applied E - field. but does not cancel completely E=0 - + - + - + - + - + - + - + Metal
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 E= 0 n E A EA A d E o o ˆ 1 ε σ = = = ∫∫ r r r Charges in metal accumulate on surfaces. E -field vanishes inside. Point charge inside a cavity in metal can sustain E -field within the cavity. Charged Conductors Charged conducting plate behaves as two sheets of charge: Gauss’s law Or, E o r σ=
Background image of page 2
3 Battery as Chemical Device to Produce Δ V Capacitor at fixed potential difference and Demonstration : charge stored at varied capacitor plate spacing d A C o ε = V C Q Δ = Real batteries have internal resistance r
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/20/2008 for the course PHYSIC 2 taught by Professor Kim during the Spring '08 term at Lehigh University .

Page1 / 9

Lecture-6-01-31-08 - Lecture-6 Materials in Electric Field...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online