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quiz2formulas - PHYSICS 2B PROF HIRSCH QUIZ 2 WINTER...

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PHYSICS 2B QUIZ 2 WINTER QUARTER 2010 PROF. HIRSCH JANUARY 25, 2010 Formulas : sin30 o = cos60 o = 1/ 2, cos30 o = sin60 o = 3 / 2, sin 45 o = cos 45 o = 2 / 2 F = k q 1 q 2 r 2 Coulomb's law ; k = 9 " 10 9 N # m 2 /C 2 ; r F 12 = kq 1 q 2 | r r 2 " r r 1 | 3 ( r r 2 " r r 1 ) Electric field due to charge q at distance r : r E = kq r 2 ˆ r ; Force on charge Q: r F = Q r E Electric field of dipole, along dipole axis: E = 2 kp x 3 (p=qd) Electric field of dipole, along direction perpendicular to dipole axis: E = kp y 3 Energy of and torque on dipole in E-field: U = " r p # r E , r " = r p # r E Linear, surface, volume charge density :
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