PPE11_PEChargedPlates - mg h = 1 2 mv 2 qE d = 1 2 mv 2...

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Potential Potential Potential Energy of Potential Energy of Charge Plates Charge Plates © RHJansen
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Gravity and Electricity Revisited © RHJansen F g = mg F E = qE F g = G m 1 m 2 r 2 F E = k q 1 q 2 r 2 g = G m r 2 E = k q r 2 Σ F = F g Σ F = F E ma = mg ma = qE mgh = 1 2 mv 2 qEd = 1 2 mv 2 U g = K U E = K For most gravity variables there is a similar electricity variable. m q g E F g F E G k h d Many equations are similar. We can sum forces if needed And as we can use work and conservation of energy
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Potential Energy © RHJansen m q g E h d ground + sky + + + + + + + U g = mgh U E = qEd W g = ∆ U g = mg h W E = ∆ U E = q Ed ( 29 The easiest zero point is the ground or negative plate
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Unformatted text preview: mg h = 1 2 mv 2 qE d = 1 2 mv 2 Example RHJansen A 5.0 C charge with a mass of 1.5 10-11 kg is located 20 cm from the negative plate in a uniform electric field of 30 N/C. a. Determine the potential energy of the charge. b. Determine the speed when it reaches the negative plate. U E = qEd U E = 5.0 10-6 ( 29 30 ( 29 0.20 ( 29 U E = 3.0 10-5 J qE d = 1 2 mv 2 3.0 10-5 ( 29 = 1 2 1.5 10-11 ( 29 v 2 v = 2000m s...
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PPE11_PEChargedPlates - mg h = 1 2 mv 2 qE d = 1 2 mv 2...

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