Lecture 22b

# Lecture 22b - Electric Field Q ="source charge E-field at P...

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1 E-field at P due to point charge Q: r r kQ E ˆ 2 Q = "source charge" E-field at point P distance = r 0 4 1  k Work on Worksheet 22a (A thru’ F) Work with a partner Come to a consensus… Electric Field

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Electric Field Lines Field lines start on + charges and terminate on ̶ charges Field lines never cross each other Field lines are closely spaced where the field is strong If 8 field lines start on a +Q charge, then 16 field lines start on a +2Q charge, etc.
In the picture, there are no charges in the regions shown. Which diagrams could represent physically possible electrostatic field lines? A B C

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Visualizing E Fields – “Grass Seeds” Point Charge
Class Question This could be the E Field around A. 2 point charges, +Q and +Q B. 2 point charges +Q and –Q C. 2 point charges +3Q and +Q D. 2 point charges +3Q and -Q

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Class Question -Q +Q -Q +Q P What is the E-field at point P? A) |E| = 2kQ / s
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## This note was uploaded on 02/05/2011 for the course PHYS 220B taught by Professor Preminger during the Fall '10 term at CSU Northridge.

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Lecture 22b - Electric Field Q ="source charge E-field at P...

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