664_Physics ProblemsTechnical Physics

664_Physics ProblemsTechnical Physics - 4 Electric Fields...

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4 Electric Fields Q23.28 In special orientations the force between two dipoles can be zero or a force of repulsion. In general each dipole will exert a torque on the other, tending to align its axis with the field created by the first dipole. After this alignment, each dipole exerts a force of attraction on the other. SOLUTIONS TO PROBLEMS Section 23.1 Properties of Electric Charges *P23.1 (a) The mass of an average neutral hydrogen atom is 1.007 9u. Losing one electron reduces its mass by a negligible amount, to 1 007 9 1 660 10 9 11 10 1 67 10 27 31 27 .. . . ×− × = × −− kg kg kg ej . Its charge, due to loss of one electron, is 0 1 1 60 10 1 60 10 19 19 −− × =+ × C C . (b) By similar logic, charge =+ × 160 10 19 . C mass × = × 22 99 1 66 10 9 11 10 3 82 10 27 31 26 . . kg kg kg (c) charge of Cl C =− × 19 . mass + × = × 35 453 1 66 10 9 11 10 5 89 10 27 31 26 . . kg kg kg (d) charge of Ca C C ++ =− − × = + × 2 1 60 10 3 20 10 19 19 mass × = × 40 078 1 66 10 2 9 11 10
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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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