Lecture02

Lecture02 - The Coulomb Force ! ! 1 Q1Q2 1 Q1Q2 ^ F =F= F=...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
The Coulomb Force Force repulsive Force attractive 1 + + 2 r F 12 + - 2 r F 12 1 ! F = 1 4 !" 0 Q 1 Q 2 r 2 ˆ r ε 0 = permittivity constant 2 2 1 0 4 1 r Q Q F F = = ! The force exerted by one point charge on another acts along line joining the charges. The force is repulsive if the charges have the same sign and attractive if the charges have opposite signs.
Background image of page 1

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

View Full DocumentRight Arrow Icon
How Strong is the Coulomb Force
Background image of page 2
q F E / ! ! = [N/C] ( ) t z y x E E , , , ! ! ! Electric Field Electric field has units of Newton per Coulomb:
Background image of page 3

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

View Full DocumentRight Arrow Icon
No ‘self-force’! 2 0 4 1 r q E !" = Point charge does not exert field on itself! r 0, E !
Background image of page 4
The net electric field at a location in space is a vector sum of the individual electric fields contributed by all charged particles located elsewhere. The Superposition Principle The electric field contributed by a charged particle is unaffected by the presence of other charged particles.
Background image of page 5

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

View Full DocumentRight Arrow Icon
The Superposition Principle
Background image of page 6
Electric dipole: Two equally but oppositely charged point-like objects What is the E field far from the dipole (r>s)? +q -q s Example of electric dipole: HCl molecule The Superposition Principle The electric field of a dipole:
Background image of page 7

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

View Full DocumentRight Arrow Icon
+q -q s x y z Choice of origin: use symmetry Calculating Electric Field Choice of the origin
Background image of page 8
1.
Background image of page 9

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

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/02/2008 for the course PHYS 272 taught by Professor K during the Winter '07 term at Purdue.

Page1 / 22

Lecture02 - The Coulomb Force ! ! 1 Q1Q2 1 Q1Q2 ^ F =F= F=...

This preview shows document pages 1 - 10. Sign up to view the full document.

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