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lecture3 - Electric Fields II Electric field produced by...

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1 Electric Fields II •Electric field produced by point charges •Continuous charge distributions Text sections 23.4, 23.5 Practice: Chapter 23 , problems 21, 27, 31 Define: ο q F E r r = is force exerted on by . E r ο q F r

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2 Example : Find: Field (vector) at the origin. C q μ 10 1 - = C q μ 20 2 = 400mm 300mm QUIZ C q μ 10 1 - = C q μ 20 2 = The electric field is also defined as force/charge. For the field we have just calculated, the “charge” in this denominator should be A) q 1 B) q 2 C) (q 1 + q 2 ) D) None of the above
3 Example: Dipole An electric dipole is a pair of equal and opposite charges placed a short distance (2 a in the diagram) apart. Derive an expression for at point B. E r y a a x B : (0,y) A : (x,0) -q +q QUIZ y a a B : (0,y) -q +q What will be the direction of the field at B? A) B) C) D) E)

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4 y a a -q +q = E 2 1 2 2 ) ( a y r + = where Answer: A note on “style”: the final result is given in terms of the variables in the original problem ( a, q, and y ). Note… 3 1 r E r (dipole) For fun: find E at point A, and show that it is approximately proportional to x - 3 , at large distance x .
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lecture3 - Electric Fields II Electric field produced by...

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