28 Electric FieldsANSWERS TO EVEN PROBLEMSP23.2(a) 2 621024.×; (b) 2.38 electrons for every109presentP23.36(a) 200 pC; (b) 141 pC; (c) 58.9 pCP23.38see the solutionP23.457 5.NP23.40(a) −13; (b) q1is negative and q2is positiveP23.62 51109.×−P23.42electron: 4 39.Mms ; proton: 2 39.km sP23.8514 kNP23.10xd=0 634.. The equilibrium is stable if thethird bead has positive charge.P23.44(a) −57 6.±iTm s2; (b) 2 84.±iMms; (c) 49.3 nsP23.46(a) down; (b) 3 43.CµP23.12(a) period=π23mdk qQewhere m is the massof the object with charge −Q; (b) 43ak qQmdeP23.48The particle strikes the negative plate aftermoving in a parabola 0.181 mm high and0.961 mm.P23.50Possible only with +51 3. Cµatx= −16 0.cmP23.141 49.gP23.16720 kN C downP23.52(a) 24 2.NC at 0°; (b) 9 42.NC at 117°P23.18(a) 18 0218.±±ij−kN C;P23.545 25.Cµ(b) 36 0436.±±ij−ejmNP23.56(a) mgABcotθ+; (b) mgAABcossinθθ+P23.20(a)
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