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formulas

# formulas - PHYS 2002 Formula Sheet Exam 2 Constants...

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PHYS 2002 Formula Sheet Exam 2 Spring 2009 Constants, definitions: g = 9 . 80 m/s 2 k = 1 4 π² o = 8.99 × 10 9 Nm 2 /C 2 m p = 1 . 67 × 10 - 27 kg ² o = 8 . 85 × 10 - 12 C 2 /Nm 2 m e = 9 . 11 × 10 - 31 kg 1 eV = e (1V) = 1 . 60 × 10 - 19 J q p = +1 . 60 × 10 - 19 C μ o = 4 π × 10 - 7 H/m q e = - 1 . 60 × 10 - 19 C Area of a circle: A = πr 2 Kinematics ( a =const): x - x 0 = v 0 t + 1 2 at 2 v = v 0 + at v 2 = v 2 0 + 2 a ( x - x 0 ) Charge comes in chunks: Q = Ne Coulomb’s law (force between point charges): | ~ F | = k | q 1 || q 2 | r 2 12 Force produced on a charge by electric field: ~ F = q ~ E Electric field strength produced by a point charge: | ~ E | = k | q | r 2 El. field strength produced inside a parallel plate capacitor with no dielectric: | ~ E | = Q ² o A = σ ² o Electric field when dielectric is present: E with = E no κ Electric flux: Φ E = E A = EA cos( θ ) Gauss’ law: Φ E = q enc ² o Relation between EP E and work done by electric force: W = - Δ EP E = EP E i - EP E f Relation between EP E and voltage difference: Δ EP E = q Δ V Potential produced around a point charge: V = k q r

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