95.26: Two positive point charges repel each other with:fui dd5i iso4 d4.f gr,:c6 h*kogkl5 force 0.36 N when their separation is 1.5 m. What force do they exert on each other when ::5o h54.6dscik*k fiiddg4 f ,golr utheir separation is 1.0 m?

  12.13 Approximately how mwm v 7)t38aw lj1 gkqb- zfmt8+daqs81any electrons must be removed from an electrically neutral o38m8aqjflkd1 tz s w) bq8a tv+1g7m-wbject to give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons inq sck5i;5ng2( qnz3x b a horizontal 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 vertx;(cb5g qkq3zsnn 2 5iical cross-section of the wire during this time?

  13.07: Two identical particles are f rd+)1 )s3l.crj.ig n6v r:tberygw2e ixed 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 following chois3w..l2 vcr ngger:i b)6yjre)rt+ d1ces best represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced by a distance R, what is the rati4ap) l 2jh1jty08cgdyp40 k t7xig* bpo of the gravitaa0p c8j0 ik1 pb7 4d*4yp2gttlx yhgj)tional 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 an experiment with a proton of cqe:/e1v a yl mmk4jg3ii* mo2-harge 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 whi-4:my/ aeeq j ogk *im3m1i2lvch object experiences the greatest magnitude of acceleration? Ignore gravity.

  94.39: A small object with charge q and weight mg is attached to on8vnm57wg8np (ax 6cz 8w kikm4e end of a string of lengtn48z7 c ipkn 5(xmwv6 k88agmwh 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 -zr;mr gnfb w3.d0m :qconnected 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 angle of θ with the vertical as shown in the figure. When the string is cut, which of the i zn0;q:g .mdf w-3rbrmllustrated paths best indicates the trajectory of the mass?

  13.29 Two electrons enter a rtny bo8 rc836eegion between charged capacitor plates with equal speed v. Electron A is directed horizontally to the left while ry8etnob3c6 8 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 a negative poig bt -8vfxc1 pvrn;mb08f.f2 pnt charge placed a distance x away. If the distance between the twop;f2t n8 g-bxfbmf0vcvr 18p . point charges is halved, what is the magnitude of the new force that the positive point charge exerts on the negative point charge?

  98.08: When two charged point-like objects l(sbl+v(qx eol:vk1,/ 8w oah are separated by a distance R, the force betwa+8kx,(o:ol l e (1qlvbh vsw/een them is F. If the distance between them is quadrupled, the force between them is

  03.18: Two identical electrical pot jf451qoih f;int charges Q, separated by a distance produce an electrical force ofF on one another. If the distance is decreased to a distance of 0.40, w5hq fo ;41ifjthat is the strength of
the resulting force?

  96.34: A point charge +q is placed midway betwee3834pmbk swa sr:swwv+4e qbh f*(my5n two point charges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of the forcywkv(3*m4psb3:5h re +b8a4w mfwqss e on the charge +q is:

  01.31: A positive point charge of +q and a negative point charge of shqx-3m4. pg,hx8sdao 39ds l-q are separated by a distance d. What would be the magnitude of the electric field s9d qoh4dsp83h x -a,3lx.sgmmidway between the two charges?

  08.33: Two point charges are fixed on the x-axis inotherwb++zkwp44w+v)6lp- 0cb illk u x voz)ise empty space as shown bewkw 4+ z k)-xbp+lzcl4p0buv+ 6lvo)ilow.
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 fixs0gv rr zublf8/2 djt)v2 +ba4ed on the x-axis in otherwise empty space as shown b+bs)jtd va 284vrr02u/gbfz lelow.
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 –4q -,ztk 3t2o3whrz)xoQ are arranged as shown in the accompanying diagram. At whict-kw3zz 2 xrq, o)t3hoh of the labeled points is the field most nearly zero?

  98.30: Four positive point charges are arranged as shown iygrg 9 (xiu5e2n 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 3 and 4 is 3.0 N. The magnitude of the total forux gye( 25g9irce on charge 3 is most nearly

  94.08: A point charge of +4hq (o*9nr*hbf.0 μC is placed on the negative x-axis 0.20 m to the left of the origin, as shown in the accompanying figure. A sqf**rnh9(hob econd 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 potential is zero at infinity. A point charge of +4.yth g70gi7lb2/p *ldd3v76v odolyu00μC 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 origin is also zero. What is q’s char*7/ gi70dohvvy7 gp yd tdlll02ub3o6ge?

  03.27: Four electrical charges arl64icap7x+ rvw,pe1s:pj qc4dfo5j *e arranged on the corners of a 10 cm square as4:fp 6jdev74rc5o,+acpjw pi x q1sl * shown. What would be the direction of the resulting electric
field at the center point P?

  14.10: Two charges −Q mj oj 8s2ofu +6.scf;jand +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 cj 82oj+fos;uf6.msjthey-axis from the origin, what is the direction of the electric field from the given charges?

  16.33 Given the configuratiocsir/auh* (a fx/j p11n of three charges, +Q, +Q, and −2Q, which one of the follorhauj1c/ i (f p*a/x1swing 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 chsf8 * x -yyum-sc;mae,arge Q, and a charge per unit length given assef*ym-xu -s cmy, a;8 $λ=λ_0cosθ$ 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?