Lecture_02_-_no_quiz_answers

Lecture_02_-_no_quiz_answers - Lecture 2 1/17 Action at a...

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Unformatted text preview: Lecture 2 1/17 Action at a Distance How can q 1 sense q 2 without direct contact? just as air surrounds us, there is an electric field around a charge that transfers the force 2 , 1 2 2 , 1 2 1 2 , 1 r r q q k F q 1 q 2 r (Force by q 1 on q 2 ) Lecture 2 2/17 Electric Field The electric field is independent of the test charge (q) and only depends on position in space r r Q k E 2 q F E Q P E at P due to a point charge (Q) r Electric field units: N/C Lecture 2 3/17 Fields Scalar Fields: temperature, pressure, etc. Vector Fields : gravitational, electric, magnetic, etc. 77 82 83 68 55 66 83 75 80 90 91 75 71 80 72 84 73 57 88 92 77 56 88 73 64 Q q r Q creates an electric field and q experiences a force due to its position within the field Lecture 2 4/17 Electric Field Lines visualization tool to illustrate the geometry of an electric field electric field lines originate from positive charges and terminate at negative charges (or at infinity) direction of electric field is tangent to the line magnitude of electric field is proportional to the density of the lines # lines/area ~ 1/r 2 ~ |E| Lecture 2...
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Lecture_02_-_no_quiz_answers - Lecture 2 1/17 Action at a...

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