110404-opp - 4/4/11 Physics 122 1 4/4/11 Physics 122 2...

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Unformatted text preview: 4/4/11 Physics 122 1 4/4/11 Physics 122 2 4/4/11 Physics 122 3 4/4/11 Physics 122 6 4/4/11 Physics 122 7 FE →m = mg grav. field of earth = 4/4/11 Physics 122 FE →m m=g 8 E (r ) = 4/4/11 Fq Fq = qE (r ) q (test charge q Physics 122 at the point r ) placed 9 g= 4/4/11 Facting on m m E= Facting on q q Physics 122 Field is the value at a position in space “ r “ assuming that the force is measured by placing the object at1r . 0 4/4/11 Physics 122 12 Field vectors 4/4/11 Field lines Physics 122 Careful! Field lines follow the direction of the field. They do NOT follow the magnitude. 13 Field lines for a dipole (colored by strength) 4/4/11 Physics 122 14 4/4/11 Physics 122 15 Fq = FQ1 → q + FQ2 → q + FQ3 → q + FQ4 → q + ... kC qQ1 kC qQ2 kC qQ3 kC qQ4 r1 + r2 + r3 + r4 + ... Fq = 2 2 2 2 r1 r2 r3 r4 where r1 = distance from Q1 to q r2 = distance from Q2 to q ... 4/4/11 r1 = direction from Q1 to q (mag. 1, no units!) r2 = direction from Q2 to q (mag. 1, no units!) Physics 122 16 Fq kC qQ1 r1 Fq = 2 r1 Fq = kC Q1 Eq = = 2 r1 q r1 kC qQ1 k qQ k qQ r1 + C 2 2 r2 + C 2 3 r3 + ... r12 r2 r3 4/4/11 Eq = Physics 122 Fq q = kC Q1 kQ kQ r1 + C 2 2 r2 + C 2 3 r3 + ... r12 r2 r3 17 4/4/11 Physics 122 18 ...
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110404-opp - 4/4/11 Physics 122 1 4/4/11 Physics 122 2...

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