H1 Electric Fields-solutions.pdf - wong(lw27737 H1 Electric Fields avram(1402 This print-out should have 23 questions Multiple-choice questions may

# H1 Electric Fields-solutions.pdf - wong(lw27737 H1 Electric...

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wong (lw27737) – H1 Electric Fields – avram – (1402)1Thisprint-outshouldhave23questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.00110.0pointsA plastic rod is rubbed against a wool shirt,thereby acquiring a charge of4.9μC.How many electrons are transferred fromthe wool shirt to the plastic rod? The elemen-tal charge is 1.6×1019C.Correct answer: 3.0625×1013.Explanation:Let :q=4.9μC =4.9×106Cande=1.6×1019C.The total charge isq=neene=qe=4.9×106C1.6×1019C=3.0625×1013.00210.0pointsWhenapositivelychargedconductortouches a neutral conductor, the neutral con-ductor will1.stay neutral.2.lose electrons.correct3.gain protons.4.gain electrons.5.lose protons.Explanation:When the two conductors touch, the elec-trons in the neutral conductor will move overto the positively charged conductor, since thelatter defines a region of higher potential thanthe neutral conductor.00310.0pointsTwo uncharged metal balls,ZandX, standon insulating glass rods. A third ball, carryinga positive charge, is brought near the ballXas shown in the figure. A conducting wire isthen run betweenZandXand then removed.Finally the third ball is removed.XZ+conducting wireWhen all this is finished1.ballZis positive and ballXis negative.correct2.ballZis negative and ballXis neutral.3.ballZis negative and ballXis positive.4.ballZis neutral and ballXis positive.5.ballZis positive and ballXis neutral.6.ballZis neutral and ballXis negative.7.ballsZandXare still uncharged.8.ballsZandXare both negative, but ballXcarries more charge than ballZ.9.ballsZandXare both negative, but ballZcarries more charge than ballX.10.ballsZandXare both positive.Explanation:When the conducting wire is run betweenZandX, some positive charge flows fromXtoZunder the influence of the positive chargeof the third ball.Therefore, after the wire is removed,Zischarged positive andXis charged negative.00410.0pointsTwo electrostatic point charges of +53.0μCand +56.0μC exert a repulsive force on each
wong (lw27737) – H1 Electric Fields – avram – (1402)2other of 177 N.Whatisthedistancebetweenthetwocharges? The value of the Coulomb constantis 8.98755×109N·m2/C2.Correct answer: 0.388209 m.Explanation:Let :q1= 53.0μC,q2= 56.0μC,Fe= 177 N,andkC= 8.98755×109N·m2/C2.Fe=kCq1q2r2r=radicalbiggkCq1q2Fe=radicalBig8.98755×109N·m2/C2×radicalbigg(5.3×105C) (5.6×105C)177 N=0.388209 m.00510.0pointsA charge of +1.5×109C is placed at theorigin, and another charge of +5.9×109Cis placed atx= 2.4 m.At what point between these two chargeswhereachargeof+3.7×109Cshouldbeplacedsothatthenetelectricforceon it is zero?The Coulomb constant is8.98755×109N·m2/C2.

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