727_Physics ProblemsTechnical Physics

727_Physics ProblemsTechnical Physics - Chapter 25 67...

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Chapter 25 67 Additional Problems P25.53 Uq Vk qq r e == = × × = 12 12 9 19 2 15 11 899 10 38 54 1 60 10 5 50 6 20 10 404 10 253 . . .. . ej a fa f a f J M e V P25.54 (a) To make a spark 5 mm long in dry air between flat metal plates requires potential difference VE d × × 3 10 5 10 1 5 10 10 63 4 4 Vm m V V e j .~ . (b) The area of your skin is perhaps 15 2 . m , so model your body as a sphere with this surface area. Its radius is given by 15 4 2 . m 2 = π r , r = 035 . m . We require that you are at the potential found in part (a): V kq r e = q Vr k e × ×⋅ F H G I K J F H G I K J 15 10 4 9 . . V 0.35 m Nm C J VC Nm J 22 af q −− 5 8 10 10 76 C C . P25.55 (a) U kqq r e −× × × =− × = − 91 9 2 9 18 8 99 10 1 60 10 00529 10 435 10 272 . e j e V (b) U r e × × 9 2 29 8 99 10 1 60 10 2 0 052 9 10 680 . . e j eV (c) U r ke e e = 2 0 P25.56 From Example 25.5, the potential created by the ring at the electron’s starting point is
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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