# Lecture_02_-_no_quiz_answers - Lecture 2 – 1/17 Action at...

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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 ˆ 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 ˆ 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...

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