95.26: Two positive point charges repel each other with c i1*ce-0k lwu*ji t/eforce 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 1.*i- c0j*uw/eet l cik10 m?

  12.13 Approximately how many electrons must be removed from an els 6oscc+(w z*yvpc1,h ectrically neutral object to give it a oc6+cshz1wpc*y,s( v net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow o9(n14el cg/p*bnw(sq gs i9g rf electrons in a horizontal wire produces a constant current of 3.20 A for a time of 3.0 hour. Which one of th(nnbqprcl iw e9g*14/s gg9s(e following choices best represents the number of electrons that pass through a vertical cross-section of the wire during this time?

  13.07: Two identical particl f d8.k* drnw9m5g0tyves are fixed in place a distance of 0.50mapart. The electric force thar*td.m0 g8wdvkf n5y9t one particle exerts on the other has a magnitude of 3.00 N. Which one of the following choices best represents the magnitude of each particle’s charge?

  07.25: If two protons are spawua5viu;,33maeiy( k ced by a distance R, what is the ratio of the gravitational force that one 5u3ikemaiw,uy a;v3(
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 settty6 ey; yf8,.+h5ft xbis ll1s up an experiment with a proton of charge Q and mass M being placed near a helium nucleus (2 protons and 2 neutrons) of charge ++tef fylbh 6yxs1i .lt, t;8y52Q and mass 4M. The objects are each released from rest and begin to move. From 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 attachey./e1jlk p/x* bokj+q d to one end of a string of length 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 cp *1/j+jebqo xy kkl./onstant angle q with the vertical. What is the sign and magnitude of q?

  09.38: A small object of mass M and charge jdet/x h+w fv(g+.c-5n6o2n r*ns ina Q is connected to an 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 an +w*vr .t6hnnsfo2(n5g+i/-ednxj ca gle of θ with the vertical as shown in the figure. When the string is cut, which of the illustrated paths best indicates the trajectory of the mass?

  13.29 Two electrons ent4.yz qi 0lio3qer a region between charged capacitor plates with equal speed v. Electron A is dl4o0 iiq.y3 zqirected 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 m3 5k-m;mtotwdn 8yeh +agnitude F on a 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 negative pom 5ethk-m td 3+nyw8o;int charge?

  98.08: When two charged al/lg 9dr rvtub- h,(+k(e w6xpoint-like objects are separated by a distance R, the foxe v 6(rltld,/+ga(r9b-whukrce between them is F. If the distance between them is quadrupled, the force between them is

  03.18: Two identical electrical ptn 96r9fj5y.a mao9 nmoint charges Q, separated by a distance produce an electrical force ofF on one another. If the distance 9aman fy6o.nmt9rj59is decreased to a distance of 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway betwe8d 9c8nwsy(f ben two point charges +3q and -q separated by a distance 2d. If Coulomb’s constasy88nf9dw b( cnt is k, the magnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a n8 c,ugwnuab2inll1iwm0; n, .mea4*a egative point charge of -q are separated by a distan ,ac 24l 1 awai0mmb8uin*.w,le;gunnce d. What would be the magnitude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on the x-axis in3x 7i8zs n1hszotherwise empty space as shown below.nz3 sh8 17zsxi
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 space anwl k,h 03byln*aih::k ;0x fms shohk 0nl,:a:x hk3f ;0wbmyl*inwn 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 +w 9*yg ycjj:;e4d vha9Q and –4Q are arranged as shown in the accompanying diagram. At which of the labeled points is the field mosthc9*jjg9 wyda 4:y ve; nearly zero?

  98.30: Four positive point charges are arranged as shown in the aisgo(6:epswcquwdgm43hpd ) c l. 2p )d/ns;8ccompanying 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 3 and 4 is 3.0 N. The magnitude of the total force on charge 3 iso3 s;c:dedg2))m 6n gpdw( l/scphqps 8u4i.w most nearly

  94.08: A point charge of +4.0 μC is placed on the negative x4eml2u4;vcq f3;ko uz-axis 0.20 m to the left of the origin, as shown in the accompanying figurevzqu4ok;leu;423fmc . 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 origin is zero. What is q?

  95.36: Assume the electric potenti6f :s: ke6 nvaw*g0jowal is zero at infinity. A point charge of +4.0μC is placed 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 origi:6anef wsj* k0wo :v6gn is also zero. What is q’s charge?

  03.27: Four electrical charges are arranged on th bgj 6 p(s d/f8z.omufv /qigb3q))(rie corners of a 10 cm square as shown. What would/ )j)o b qg /.68mug 3(ip(vqfbrsifzd be the direction of the resulting electric
field at the center point P?

  14.10: Two charges −Q and q2u zm7hb 3pt ;osn.*u+Q, are fixed in place on the x-axis, each a distance a from the origin as shown. At the point labeled P, a distance along they-axis from the origin, what iu*s n p.mthu3b7z;2q os the direction of the electric field from the given charges?

  16.33 Given the configuration of b2su97:m6e q(n b npieawbehm+gc982three charges, +Q, +Q, and −2Q, which one of the following+ 2q :guebi2c9bn(7pshemnw a6m 89be 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, total charge Q, and a charge per ;;b9f* out)gmhj kr/punit lengttb ;kj)h;9/g p*orumfh given 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?