chargedensity - Math 21a Supplement on Charge Density...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Math 21a Supplement on Charge Density Surface integrals arise in the physics of the manner in which electric charge is distributed over the surface of an electrically charged object. To a first approximation, the story goes as follows: A typical solid object (think of a ball, pen, comb, . ..) that you pick up will be electrically neutral. This is to say that it contains the same number of negative charges as positive ones. Here, the negative charges are carried by electrons from the constituent atoms, while the positive charges are carried by the protons which make up (in part) the nuclei of the constituent atoms. Moreover, since like charges exert a mutually repelling force, there will be local neutrality also. This is to say that the net charge in any macroscopic region of the object will also be zero. Now, it turns out that there are various ways to add electrons to objects or take away electrons and thus give the object a net electric charge. For example, rubbing a plastic comb on a
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

chargedensity - Math 21a Supplement on Charge Density...

This preview shows document pages 1 - 2. Sign up to view the full document.

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