95.26: Two positive pointzgvd3c ,+rj;coa s1:p charges repel each other with force 0.36 N when their separation is 1.5z+cog,;s1 j r vadc:3p m. What force do they exert on each other when their separation is 1.0 m?

  12.13 Approximately o4om;,luu+-y *kl) ak4mt cwyhow many electrons must be removed from an electrically neutral object to give it a k cum4mly oto);l* ,awk4u-+ ynet charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal wire prod quq oat:r:g:1uces a constant current of 3.20 A for a time of 3.0 hour. Which one of the following choices best represents ther:qq:a1 uo:t g 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 0.50mbxyc-(ivs nhz ;e 0f5d6)jcqmn7s4 t,apart. The electric forcec sqh0)m5tsf y7zbxv ,j-n46nd;(cie that 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 protonr3 )q8m5-d/ oge e0zmnjb -reps are spaced by a distance R, what is the ratio of the gravitationq8j3gzmr ee-rd n m/ 5-)p0obeal 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 pt4py2/qhx p rqz d0xq 4 6nb+8oys3a1sroton 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 maao +qy2/p 841x3x0s4 dzyqqhnr6p btsgnitude of acceleration? Ignore gravity.

  94.39: A small object with charge q and weigh 9bu0eaeo9vfn07 e r*it mg is attached 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 9eiaveur* 7bof en009field, 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 7nsh/c)a +b,8h7 grsdd s6v9tdy/yqvlro9y*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 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 th 7,nsr6q89v+dhcgdoya7tlr*yvsyd h/b9/ )s e mass?

  13.29 Two electrons 4f 3cut q6 2dix;vd(jqenter a region between charged capacitor plates with equal speed v. El2d4vdfxi qqj;3t6c( uectron 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 onc8.x-xwurfzd -ztt 6)l6h4e c a negative point charge placed a distance x away. If the distance between the two point charges is halved, wha -w x-.fz8tcd)ex6t hu 4rzc6lt 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 +2ke*:v jiodaobjects are separated by a distance R, the force between them is F. If the distance between them is+ *2:v kojadie quadrupled, the force between them is

  03.18: Two identical electri2l26anqe x 011ol dldxuv 5ci6cal point charges Q, separated by a distance produce an electricdxoqc2i2 a1ll6056vx1d lun e al 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 betfgrgtk-9 m1 +ddchgo.v 8ah55ween two point charges +3q and -q separated by a distance 2d. If Coulomb’s constag1+9k5ghhc8m 5.fo-gvddtra nt is k, the magnitude of the force on the charge +q is:

  01.31: A positive point cha)l:oid k:fx j.rge of +q and a negative point charge of -q are separated by a distance d. What would be the magnitude of the electric )flj:ox.:dik field midway between the two charges?

  08.33: Two point charges ar ehr4 n1nkqy9.xh:p cfef 2xdy:v+(1n e fixed on the x-axis inotherwise empty space as shown belowhvn4cfhfy:ne2q(:d p+ 1x k e9r 1.xyn.
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 2b1mqzf ..j2 f7+oz0 tkgtb) eost3gk otherwise empty space as shoe+gb tfo2 )0zm217ks.kfjgt.b zoq3twn 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 and –4Q are arranged as shown in the accompanying 19wnl 4hug3btdiagram. At which of the labeled points itbg9w1n l4uh 3s the field most nearly zero?

  98.30: Four positive point charges are arranged :*sycfo kp r;+as shown in the accompanying diagram. krs* cf :;+opyThe 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 is most nearly

  94.08: A point charge of +4.0 μC is a(w)9 yxpbsb 2placed on the negative x-axis 0.20 m to the left of the origin, as wpaxyb(sb9)2 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 origin is zero. What is q?

  95.36: Assume the electric potenti.e/rq67gv rfq al 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 figg 6/revr.q f7qure. 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 charge8 zk5x1aoyy j,s are arranged on the corners of a 10 cm square as shown.a8oxzyk y,15j What would be the direction of 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 distance5z i6w6y)w fh6soe,if52m isq is zi oq5s56wi2fey m6w6hf ,)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 field from the given charges?

  16.33 Given the configuration of three charges, +Q, +Q, and −2Q, which ax0z 1/rutgp xd1p7 q(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 cdzr 1 ptq170a(/gx puxharges?

  17.43: A semi-circle has radius R, total jpya jw(w4dr), /bh4o charge Q, and a charge per unit length given a h(/pjw)j rwab4,y4o ds $λ=λ_0cosθ$ 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?