95.26: Two positive point charges repel each other with force 0.36 N xitun *:r r+h.baq0d;4f6p lxwhen their separation is 1.5 m. What force do they exert on each other when theiri6f. 0pl *4x xqdah;ru+rbnt: separation is 1.0 m?

  12.13 Approximately how many electrons must be rem:mk 0sq y,ihl)oved from an electrically neutral object to give it a net charge of Q = + 0qk:ly)is m,h1.00 C ?

  13.15 In a circuit, the flow of elec7z:k rvv +pysw719 6ge)bte1try2 jcqtrons in 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 v vrev97s ztw6+:p)k rcqj2g17yyb1et ertical cross-section of the wire during this time?

  13.07: Two identical particles are fixed in place a distance of 0.50mapart. The b6m tl p,v:,ze0v4xjtmf 4q7zelectric force that one particle exerts on the other has a magnitude of 3.00 N. Which one of t zbtt 60,4,p74v:x qzvfmml ejhe 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 thew1fqlo(8l)wec -/ sfmfk-a l ( gravitational force that onekc)weml o- f(81lfqw-l( fa/s
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 ;- d;*y r-zigmjmdto2 0yi nx4a 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 magnit*jmgy t ; y2-4oizd nmx0;di-rude 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 at4pzbzb7ok15qt/dkv / my37 cztached to one end of a string of length L. The other end is attached to a stationary support. The system is placed in a unic p7bzmk3qy745/1 obztvkz/ dform 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 macnjre6s grnz13 i40 v7ss M and charge 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 ri3snr06gn cz ej41v 7string is cut, which of the illustrated paths best indicates the trajectory of the mass?

  13.29 Two electrons enter a region between chargj 1u wkni9w:*eed capacitor plates with equal speed v. Electron A is directed horizont k19:ew ju*wnially 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 magnitbw ;6ps)mrq3yude F on a negative point charge placed a distance x away. If the distance between the two point charg63 w;qbyrmps)es 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 are separated by a vvb,w(-pd r4 kdistance R, the force between them is F. If the pvd ,4 kb-vrw(distance between them is quadrupled, the force between them is

  03.18: Two identical electrical point charges Q, separ di-:hrpkl pps)).e+tbin1k 9ated by a distance produce an electrical fotipsd.p)blik91rp k)n : -h +erce 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 between two point charges +3qtav--.npen9b8yhk z c b66b i/ and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of tbzpb-bn nv -9hyt 6.i/kec86a he force on the charge +q is:

  01.31: A positive point charge of +q and a negative point c tem9ndl5kux.*zczio +8 v7y4wje0 7 hharge of -q are separated by a distance d. What would be the magnitude of the t5je hx co 7.euwnz8 l4yd+vi9*z0km7 electric field midway between the two charges?

  08.33: Two point charges s24cj. j ,vovdnz5e2nare fixed on the x-axis inotherwise empty space as shown below.sjced 2524v.,vzn onj
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 emm 6 n2mbl3f 6sap*-e8 zfsjuaht/q5t6 hdd:f3 pty space as shown below.5 f/ mjaplhufz et-ab6 st 6d2q:fsnh3*3m86d
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 asp0ri3cu-d f:y: ynael) w1wm484 p yo)/hv gse shown in the accompanying diagram. At which of the labeled points is the field most nearly euo-dy30n /4py)l:s :vg waiyr1hcpmw8)4ef zero?

  98.30: Four positive point charges are arranged as shown in the acc dzm+dj0v9b,s ompanying 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 most ne zd0d9j m,bvs+arly

  94.08: A point charge of +4.0 μC is placed on the negative x-axis 00)kci7i)q orv2xmr : z7jtix3.20 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 0.30k:o t2j7 vizrc r)30 imi)xx7q 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 infxd-otme4 6e k09 el p:4,kembsinity. 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 positiv: 9mxee0kb6elotk,eds 44 - mpe 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 the corners of a 10 cm square 5tpag/y 2+9pauw;5atr8 on izas shown. What wouldp/r;+aapui z5toywan8g 9t52 be the direction of the resulting electric
field at the center point P?

  14.10: Two charges −Q - 2xgkiixx 63nfwm7qc h++ldt2 5kd2cand +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, whaf d+k7kg6i2lnxd tqc2x-h 23w 5m +cxit is the direction of the electric field from the given charges?

  16.33 Given the configuration of t8h ,k ,s.udtamtv. -athree charges, +Q, +Q, and −2Q, which one of the following choices best suta htvm8..,k,-atdrepresents 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(k1wo r. ibl(w y.vm;r charge per unit length gir w(w..;oybrm (k1v liven 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?