95.26: Two positive point charges repel each other witbb.jz4zpnb-yy +c*m ,:vgvh / h force 0.36 N when their separation is 1.5 m. What force do they exert on /ghvcjv +-y zmz,n4p*b.b y b:each other when their separation is 1.0 m?

  12.13 Approximately how many electrons muq y;6y oxk6dm fm:v/(ast be removed from an electrically neutral object to give it a net charge of Q =q kyxf6/m o; yv(6dm:a + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a h dyc-n) sss.;xorizontal wire produces a constant current of 3.20 A for a time of 3.0 hour. Which one of the following choices best represents the number of electrons that pass through a ssc xs.n)d;y- vertical cross-section of the wire during this time?

  13.07: Two identical par p,)d)f 3(lavizq qz6rticles are fixed in place a distance of 0.50mapart. The electric force that one particle exerts on the other has a magnitude of 3.00 N. Which one of the followi fzz3qvl rq)6i (pa,d)ng choices best represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced)lg7c j-z 7np a51gabj by a distance R, what is the ratio of the gravitatin)p lg1 a7gj-bc5a 7zjonal force that one
proton exerts on the other to the electric force that one proton exerts on the other?That is,$\frac{F_{gravity}}{F_{electric}}$=

  10.12: A scientist sets up mv7s f5,kdg )yan experiment with a proton of charge Q and mass M being placed near a helium nucleus (2 protons and 2 neutrons) of charge +2Q and mass 4M. The objects are each released from rest and begin to move. Fr gkd, ysf7v)5mom the scientist’s point of view, which choice best describes the object that experiences the greatest magnitude of electric force from the other and which object experiences the greatest magnitude of acceleration? Ignore gravity.

  94.39: A small object with charge q and weight mg is attach8nmq(: 5xzrbo(d2l xxed to one end of a string of len b(x52od l8qm (zx:nrxgth L. The other end is attached to a stationary support. The system is placed in a uniform horizontal electric field E, as shown in the accompanying figure. In the presence of the field, the string makes a constant angle q with the vertical. What is the sign and magnitude of q?

  09.38: A small object of mass M and charge Q is connected to gt6 9pvlnj)kz vf+hg4/3p 5q ian insulating massless string in a vacuum on Earth. A uniform electric field exists throughout the region of the vacuum as indicated. The mass remains in static equilibrium at an angle of θ with the vertical as showng+fpz4 3 jv/ ivn6hqtp)l g59k in the figure. When the string is cut, which of the illustrated paths best indicates the trajectory of the mass?

  13.29 Two electrons enter a region between charged capacitot hh/)1y cpx9kr plates with equal speed v.px k91y th)h/c Electron A is directed horizontally to the left while electron B is directed at$30^{\circ}$below the horizontal. Each electron makes it to the left-hand plate. Which one of the following choices best compares the speeds of the charges ( $V_A$, $V_B$) upon arrival at the left plate? Consider only the electrons A and B’s interactions with the constant electric field between the plates, ignoring any relativistic effects.

  08.06: A positive point charge exerts a force of magnitude F on awxrwu i,-l v 9u:a*k7m negative point charge placed a distance x away. If the distance between the two point charges is halved, what is the magnitude of the new force that the positive point charge exerts on the negativeu -*9vr,wxi ku7 alwm: point charge?

  98.08: When two chargedqt ewo ea*3g21 point-like objects are separated by a distance R, the force between them is F. If the distance between them is quadrupled, the force betweeet3e1qg *w oa2n them is

  03.18: Two identical e iuamaab1j(206sl s8rlectrical point charges Q, separated by a distance produce aa8m b s r12u(0saj6lain electrical force ofF on one another. If the distance is decreased to a distance of 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway between two point charg b 0xe.ucjophqh6d28 5es +3q and -q separated by a disth 2o8xc65qdbh epuj.0ance 2d. If Coulomb’s constant is k, the magnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a negative point charge of -8lqd+09 f +v gm eota4t/m*xjkq are separated by a distance d. What would be the magnitude of the electric field midway between q 8+m a0gxvflo 9 e4/djt*k+tmthe two charges?

  08.33: Two point charges are fixed on nra fenj(vf 1)9( js)mthe x-axis inotherwise empty space as shown belosjan(fv(9r)f m n)ej1 w.
In which Region(s) is there a place on the x-axis (aside from infinity) at which the electric potential is equal to zero?

  08.34: Two point charges are fixed on the x-axis in otherwise empty spa+ir hmfrt-2 +yce as shown m fy hr2it-r++below.
In which Region(s) is there a place on the x-axis (aside from infinity) at which the electric field is equal to zero?

  98.23: Two charges +Q andhn97m u5+k0kjsq ckasqw)9,n –4Q are arranged as shown in the accompanying diagram. At which of the labeled points is the field most ne+h q)n57msu q9knjck,k0w as9arly zero?

  98.30: Four positive point charges are arran poo7. kqo.pc02l1auk0ektom. bj/i 8ged as shown in the accompanying diagram. The force between charges 1 and 3 is 6.0 N; the force between charges 2 and 3 is 5.0 N; and the force between charges q oo.ok/tipm1c 0lu0j kak.b8p2 .o7e3 and 4 is 3.0 N. The magnitude of the total force on charge 3 is most nearly

  94.08: A point charge of +4.0 μC is placed onj5r wjxz4-l 1e the negative x-axis 0.20 m to the left of the origin, as shown in the accompanying figure. A second point charge q is placed on the positive x-axis 0.30 mto the right of the origin. The net electric field at the orirwjl-ez4 j5 x1gin is zero. What is q?

  95.36: Assume the electric potential isad,tf66 q-xzarkg(q ;y t:s d1e2i*sx zero at infinity. A point charge of +4.0μC is placed sf k 61y -dtixad2:r tgq,aszex6(q*;on the negative x-axis 0.20 m to the left of the origin, as shown in the accompanying figure. A second point charge q is placed on the positive x-axis 0.30 m to the right of the origin. The net electric potential at the origin is also zero. What is q’s charge?

  03.27: Four electrical charges are arranged on the corners of a 10 cm sq(t(1kl ql2h4l(vh kfne lkb pv20k17c uare as shown. What would be the direction of tf1k 0kh nvlh1( 4bqletlvc2p(l 72( kkhe resulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, arlf50icl *p8 hycfqo2u p-r/4 se fixed in place on the x-axis, each a distance a from the origin as shown.2l-i48f/0f*5c y qpc psorlhu At the point labeled P, a distance along they-axis from the origin, what is the direction of the electric field from the given charges?

  16.33 Given the configuration of three charges, +Qubu yg6 v:zc:+, +Q, and −2Q, which one of the followi:c+ vzb6:yugu ng choices best represents the direction of the electric field at the point P and the sign of the electric potential at P from these charges?

  17.43: A semi-circle has radius R, e/:+ oxlp ql+atotal charge Q, and a charge per unit length given ol:xel+/q+ap as $λ=λ_0cosθ$ with θ defined in the figure and $λ_0$ a positive constant. Which one of the following choices gives the electric field strength at the point labeled P?