95.26: Two positive point charges repel each other with force 0.36 N when their wyp/tz3lx -6iseparation is 1.5i3-ptzl /y 6xw m. 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 electricaggx)i fum+yh 0djz/x 52me8)x lly neutral object to give it a net charge of Q = + 1.0dx y)x)+ezj f8gh25 0/ gmuxim0 C ?

  13.15 In a circuit, the5 mkke 9b .jtyk0/zb,n flow of electrons in a horizontal wire produces a constant current of 3.20 A for a timekzb9/05nt.kj ekmy b, of 3.0 hour. Which one of the 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 particles are fixed in place a distance of t w-oiu)f.c*s ;hkrc 3e .qu:r0.50mapart. The electric force thas3wc.hor. * :kq)ic- eruu;ft t 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 spaced by a distance R, what is the ratio of the grax u*d; bt;t q u3.pldw*4wba9xvitaab;w xpu 4*td.xtl*3dwu;9 bqtional 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 exh1r* cc: pz9 z rt31eg*rg-bmmperiment with a proton of charge Q and mass M being placed near a helium nucleus (2 protons and 2 neutrons) of cham1zh*zg *bc3- 9pr1g r t:ercmrge +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 gravity.

  94.39: A small object with charge q and weight mg is attache ku0:cq*o pt uwpjvkiw/00budq,8d 3.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 hot80uqv3wq, dod 0iwpu/pbk:j0ukc *. rizontal 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 connect;ei ml4iw d4oev.wg2h6u t99q ed to an insulating massless string in a vacuum on E ui;eg vd69t4wlqmo w.49e2hi arth. 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 the mass?

  13.29 Two electrons enter a region/cva 3:n48 ,00doeoiemz jtmq between charged capacitor plates with equal speed v. Electron A is directed horizontall04,z0e3j m nqte vmidoa: /co8y 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 a negativer- +uttc uwh,, point charge placed a distance x away. If the distance between the two point charges is halved, what is u,tcw +-rt,uhthe magnitude of the new force that the positive point charge exerts on the negative point charge?

  98.08: When two charged point-like objects are separated by ar+qevv; hl0/h distance R, the force between them is F. If the distance between them is quadr0vhhr/q; +e vlupled, the force between them is

  03.18: Two identical electrical point ra 8-ofz1c2w.pbfuox8ogsi ; .t/7zccharges Q, separated by a distance produce an eco aw8 ib7.8tz;fx c-zo /sgpfr.2ou1lectrical 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 betbei6n8 po86 zsween two point charges +3q and -q separated by a distance 2d. If Coueob8psi6n6 8 zlomb’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 poinq-* kabb.8phrxh(27uoef t2si jryl (3x9+gv t charge of -q are separated by a distance d. What would be the magnbrh+8yaruo pq ( i3gks2hf-(*ej7lx2 9tvbx.itude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on the x-axis inotherwise empty space as show*+;f)axq s*ep8eee n un bp s;+qf uneee8x ae**)elow.
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 asfu8b:re3z a6j shown below8ufar :jz be36.
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 fvb(. w.(kp-fa k s*pqdiagram. At which( qf-vakpk p*.s (fb.w of the labeled points is the field most nearly zero?

  98.30: Four positive point charges ag -n8zto6g -phre arranged 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 3 and 4 is 3.0 N. The magnitude of the total force on charge 3 is t6hp-ong8- gz most nearly

  94.08: A point charge of +4.0tcv vsh) vy ov1a7lp)r/i: -55qdx0 mq μC 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 mto the right of the origin. The net electric field at tsp/5 -vchxv5lq i )trvd1voa:m)70 yqhe origin is zero. What is q?

  95.36: Assume the electric potential is zero -1 fabil k i:q*svu by1 w(dsceutuw,x+6:l60at 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 charg ,* 1w-6e :uc 1lw:a0xu vbifsiqdl(ksy6ub +te 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 mfyb4aaq 52c,/ et m+ethe corners of a 10 cm square as shown. What would be the direction 52/+ ,f bm4qe ceaatmyof 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 distancifg u5u4,0 e,sxe wunv+ g;;tse 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 g,;,uex;uu0inwes4gt5f sg +v iven charges?

  16.33 Given the configuration of three charges, +Q, +Q, and −2Q, whicblqd jx+47hi /e1-rzhh one of the following choices best represents the direction of the electric fielijez7 q/d4hl1 hxb +-rd at the point P and the sign of the electric potential at P from these charges?

  17.43: A semi-circle hasea*zf (s45v,sq zh,b s radius R, total charge Q, and a charge per unit length givf4v(e, zzh b,sa5 sqs*en 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?