95.26: Two positive point charges repel each other with force jdv(mn47s 9 pu0.36 N when their separation is 1.5 m. What force do they exert on ea 9n p(4d7uvmsjch other when their separation is 1.0 m?

  12.13 Approximately how many electrons must be removed from an ele3 ,bmthz-u2:zcil8k+ nqqy4 fctrically neutral obj-:cqul3q,f bkti ny4z28hzm +ect to give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of elect h-+v. ccbd:41k qvaairons 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 vka.4i ah+b-:vcc 1dq through a vertical cross-section of the wire during this time?

  13.07: Two identical particles are fixed in place a distance ofsll g4d.ug0 j; 0.50mapart. The electriulgjsdlg;4 .0 c force 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 protons are spaced by a distance R, what is the ratio of th:0 9ylgx t-do (sr- da5hdju6xe gravitational force tra0j-9 g x s(tduxh:-d5ly6dohat 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 protonwso89bp ga:w+a; 7een 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 ex+bpw:;on9w eesa 87g aperiences the greatest magnitude of acceleration? Ignore gravity.

  94.39: A small object with charge q and weigu:0,ug 3trq sf /tgnq:ht 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 field, the string makes a constant angle q with the verticalgguq/: nf3 rq,ts:tu0. What is the sign and magnitude of q?

  09.38: A small object of mass M and charge Q is s:sj r-s24txf2zhl,b connected to an insulating massless strist, 4:- b2zj rsxf2hslng 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 the mass?

  13.29 Two electrons enter a region between charn d9xf-ng*l, eged capacitor plates with equal speed v. Electron A is directed horizontally to the left while electron B is directed an-g xfdn el,9*t$30^{\circ}$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 forc+uhiw7o+wb zqd +yo)-e 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 thzbyih+q+ )7-uw o+ owdat the positive point charge exerts on the negative point charge?

  98.08: When two charged point-liken )n1 pnng/+;nu7d6zf ggn-ti objects are separated by a distance R, the force between them is F. If the distance between them is quadrupled, theu)nng; n-fn z ng/6p7tdn1+gi force between them is

  03.18: Two identical electrical point charges 81u jqs kt:k5jzb79hqQ, separated by a distance produce an electrical force ofF on one another. If the distance is decreased to a distance of 0.40, what is jqk5 z78:kj btusq1h9 the strength of
the resulting force?

  96.34: A point charge +q is placed midway between two point char r/i7xw z8y(xsges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of xis /(r7wzy x8the force on the charge +q is:

  01.31: A positive point charge of +q als 2hox w1) vh ea d5,p99yjzt/92xodtnd a negative point charge of -q are separated by a distance d. What would be the magnitude of the electric field midway between the tw o o1j xlytp/d9x9d5v9t,eah2)2hsz wo charges?

  08.33: Two point charges are ficr;oot9 g* i0lt1fg:jxed on the x-axis inotherwise empty space as shown belowrtl0oo1gjgf;: 9 i t*c.
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 charges430uiuuwn ,sa;c 0mnq are fixed on the x-axis in otherwise empty space as shown below.u,0a3;u4 iqms0u nnwc
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 the7cwoh ke yelas(9q4w)g2t;0 q accompanying diagram. At which of the labeled poiee q lkh) 2y ;7cga9s0(t4wwoqnts is the field most nearly zero?

  98.30: Four positive point charges are arranged as shown in the arko* 5+m w15lcsmqr) accompanying diagram. The force between charges 1 andqwsc5lr*o)ar 5m1 m+k 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 placed on the negative x-axif1wnea. oy a1j.3kh 3ms 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 o3 aw.e1ma3n h.fo1yjkf 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 ch hz40ln:2 bl1e dcu)fuarge 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 positive x-axis 0.30 m to the right of the0uld n1cubl z:)hf42 e origin. The net electric potential at the origin is also zero. What is q’s charge?

  03.27: Four electrical chfnx(temmagr)4-nq7o-sfs / ffo *))barges are arranged on the corners of a 10 cm square as shown. What would be the direction of the resulting electri*)f7qf oofx4nf( brst-ga nm)se) / -mc
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis, each h tz-+odvtp6 ykk(l2am*3b 7wa distance 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 thd t-k(pz o3h2kvy* 76balm wt+e given charges?

  16.33 Given the configuration of three charges, +Q, +Q, and −2Q, which one of uvmp/-wh(r03p( fznwy c *f5nthe following choices best re0(n c( vpmpr/f3hnuw 5z *w-yfpresents 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 ha g hhk-lnwk x*ea6)r1+s radius R, total charge Q, and a charge per unit length w*ahl-+61 krghex k)ngiven 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?