95.26: Two positive point charges repel each other with rb4rwh o3*.hk force 0.36 N when their separation is 1.5 mhw 43rrhko.* b. What force do they exert on each other when their separation is 1.0 m?

  12.13 Approximately how many electrons must be removed from an electricallyt9lo;. b.j i.s e,fqiq neutral object to give it a net chq f lej. .iibq,so;.t9arge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal wire produces a cons5-3qs gp ehmbz1c:s2 stant current of 3.20 A for a time of 3.0 hour. Which one of the following choices best repc 3 g1epqshzssb52- m:resents the number of electrons that pass through a vertical cross-section of the wire during this time?

  13.07: Two identical particles are fixed in place a distance of 0.5uopfah;y r,zwhv(8xm74r0)d0mapart. The electric force that one y 0mw f ,ovr 4hd7;8auxhz)r(pparticle 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 spaced by a distance R, what is the ra4z )plnqk06cx p s80xttio of the gravitational fox lzc pq0 4ksp)n06xt8rce 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 sz) v,)y a2cbwlets 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 +2Q 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 ,v yawlc )2zb)gravity.

  94.39: A small object with charge q and weight mg is atta).swo5if ,bdo6up/ jnf, bgy4 ched 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, t pwi,4s b.f/yguodo 5nfj6)b,he 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 cowfh0; ue)0fu p xgoc,z 7tk*c.nnected to an insulating massless string in a vacuum on Earth. A uniform electric field exists throughout the region of the vacuum as indicated. cz,7*g.0kctp h ;eu0of u wx)f The mass remains in static equilibrium at an angle 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 enter a region between cha-ij0i b + u22mtl+kdt. pbmgn2rged capacitor plates with equal speed v. Electron A is directed horizontally to the left while electron B isj2igi+- b0tmp+bdkt2lnum.2 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 :q )qo3vfpx 0qiumk9ilm:) p;rot2 w/of magnitude 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 exertwtiq2vf09m)o q/ l; :pmx k3)rup oqi:s on the negative point charge?

  98.08: When two charge9(v4:gwbzcao/ / bvayd point-like objects are separated by a distance R, the force between them is F. If the distance between them is quadrupled, the force bvo9 b:aygw/ bcav/(4zetween them is

  03.18: Two identical electrical point charges Q, separated by a distance proejoyfpz q)+hsg(. -ai6ul 9b9duce an electrical force ofF on one another. If the distance is decreased to a di6slp eq o- i99 a+y()zj.fhbugstance of 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway between two poinh/m /ge(k)( q s*nkorbdyi(wjgyr 252t charges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude ofiyjbm g swrq5h/n2k( /*k(rdyeo(2)g the force on the charge +q is:

  01.31: A positive point charge of +q and a negative point charge ou ip;pc ph.uk66uw,3 uf -q are separated by a distawpp6h u;6uucui ,.pk3 nce 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 inou ;wuzm;xc3k63 lf5gm 7:qley therwise empty space as shown below.f7u:muwm xcq;g llz336; key5
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 ogg7n 3 v0.dvfe jh,vl:n the x-axis in otherwise empty space as shown belowfld .g3,gne7vj:0 h vv.
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 and 0af(hw j g0gl6;jo qp oe6imss* m42,f–4Q are arranged as shown in the accompanying diagram. At which of the labeled points is the field ej*(og4amsq0sgpf h6;wli,f m0o2j 6most nearly zero?

  98.30: Four positive point charges are arranged as shown in the accompan4i y)-jue,igj5v1pfs *acq u:ying 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*)5 ygjacu,ei1:q s p fj-uvi4 of the total force on charge 3 is most nearly

  94.08: A point charge of +4.0 μC is placed on the negative x-axis 0.20 m to tm.w;)tkl pd-hiv pk0 vgw4/j(he 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 v-/ m 0vgikj ;)lwtp kd(h4.wporigin. The net electric field at the origin is zero. What is q?

  95.36: Assume the ele/1yef: /sj ziuk m,ru+/epm 2dctric potential 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+:js/f1/i pm/ru,mkeuz2 d y e 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 th;ka(ihmp,s9 ne corners of a 10 cm square as shown. What would be the direction ofnh;ms9 k( iap, the resulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis, each a dist u9egy;,bx1 / a1lzxz3j ,kzvlance a from the origin as shown. At the point labeled P, a distance along they-axis from the origin, what is the direction of the electric fieldx zega ,vkxzb; /j3l11l,yu9z from the given charges?

  16.33 Given the configuration of thdp4au 3pt alf(vk(p6sjc /;h0ree charges, +Q, +Q, and −2Q, which one of the following choices best represents the direction of the electric field at the point P and the sign of the electric potential at P from these cha f 4(h3(dtauppsl;k a/c6 p0jvrges?

  17.43: A semi-circle has radius R, total charge Q, and a charge per uns7 g:;hrbcfi26ta 5 juit length gr t:gasuh7 ;cfjb6i 25iven as $\lambda ={\lambda }_{0}cos\theta$ with θ defined in the figure and ${\lambda }_0$ a positive constant. Which one of the following choices gives the electric field strength at the point labeled P?