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Unformatted text preview: Illllllil lllr@ lIilllltI rd]L'iJ"s ttIff .e Tutoring problem available (at instructor's discretion) inwileyPLIJS and WebAssign g s M . t - r . a t# ssM What must be the distance between point charge qr: ,0 pC and point charge ez : -47 .0 p.C for the electrostatic force tween them to have a magnitude of 5.70 N? "S# In the return stroke of a typical lightning bolt, a current 2.5 x 101A exists for 20 ps. How much charge is transferred in lhis event? A particle of charge +3.00 x 10-6 C is 12.0 cm distant from a lecond particle of charge -1.50 x 10-6 C. Calculate the magni- lucle of the electrostatic force between the particles. r$ llw Two equally charged particles are held 3.2 x 10-3m Irllirrt and then released from rest. The initial acceleration of the lirst particle is observed to be 7.0 m/s2 and that of the second to he t).0 m/sr. If the mass of the first particle is 6.3 x 10-7 kg, what ture (a) the mass of the second particle and (b) the magnitude of lhe charge of each particle? ,'7 In Fig. 21-22, three charged particlcs lie on an x axis. particles I :rnd 2 are fixed in place. Particle 3 is free to move, but the net , L t : # 1 - z : 4 Additional information available in The Flying Circus otf Physics and at flyingcircusofphysics.com 21-4 Coulomb's Law WryYV Worked-out solution is at ILW Interactive solution is at electrostatic force on it from parti- cles 1 and 2 happens to be zero. If Lzt : L,r. what is the ratio q1lq2? ..8 In Fig. 2I-23, three identical conducting spheres initially have the following charges: sphere A, 4Q; sphere B, -6Q; and sphere C, 0. Spheres A and B are fixed in placc, with a center-to-center separation that is much larger than the spheres. 1 . . - S - - l i- l Two experiments are conducted. In experiment 1, sphere C is touched to sphere A and then (separately) to sphere .8, and then it is removed. In experirnent2, starting with the same initial states, the procedure is reversed: Sphere C is touched to sphere B and then (separately) to sphere A, and then it is removed. What is the ratio of the electrostatic force between A and ^B at the end of experiment 2 to that at the end of experiment 1? ..9 SSM w\,vw Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.108 N when their center-to-center separation is 50.0 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an electrostatic force of 0.0360 N. Of the initial charges on the spheres, with a positive net charge, what was (a) the negative charge on one of them and (b) the positive charge on the other? ..10 S In Fig. 2I-24, four particles form a square. The charges are q1: e q : Q a n d q 2 : e 3 : q . ( a ) W h a t i s Qlq if the net electrostatic force on particles 1 and 4 is zero? (b) Is there any value of q that makes the net elec- trostatic force on each of the four parti- [ - r - - ] l Fig- 21-25 Problems 1 3 . 1 9 , 3 0 . 5 8 ....
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