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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 e j . Its charge, due to loss of one electron, is 0 1 1 60 10 1 60 10 19 19 × = + × . . C C e j . (b) By similar logic, charge = + × 1 60 10 19 . C mass = × × = × 22 99 1 66 10 9 11 10 3 82 10 27 31 26 . . . . kg kg kg e j (c) charge of Cl C = × 1 60 10 19 . mass = × + × = × 35 453 1 66 10 9 11 10 5 89 10 27 31 26 . . . . kg kg kg e j (d) charge of Ca C C ++ = − × = + × 2 1 60 10 3 20 10 19 19 . . e j mass = × × = × 40 078 1 66 10
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