95.26: Two positive point cy+k e1m4l-j4tg cpcg)h+ nl-wky+no j,.pnj 9harges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each oth4. 1po -4ln)y-+enkyck+, lg9t +np jcwj gjmher when their separation is 1.0 m?

  12.13 Approximately how many electrons must e7ikkf3 hj.gn/m 483rl7q usibe removed from an electrically neutral object to give ifsi 37n rlgk4q7jmie3 8kh ./ut a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal wire pe( yo ozr. -jwknv28- 4wqmlp/+k 1nan(b jf;zroduces 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 vertical cros2r(/ mj4lpjn. k wn q8ybonvw -ke1zzf+a(o;-s-section of the wire during this time?

  13.07: Two identical particles are fixed in place a5ax ta o0ife7+ c7p9ic 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 choices best i9ixa 0afo577+pcct e represents the magnitude of each particle’s charge?

  07.25: If two protons are spacyhx d2t2bg)6z qt0th x6b/ ts0ed by a distance R, what is the ratio of the gravitational force that o t h2x/q60zd)bt xg h0b6tyt2sne
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 experimkad. ;n-+x csfent with a 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 magnitude of electric forcak; - csf.xn+de from the other and which object experiences the greatest magnitude of acceleration? Ignore gravity.

  94.39: A small object with charge q and wein9dr msg 7am6mbz-(3t ght 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 elect7tsa-3n 6mzr(9 bdg mmric 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 connected tokklij oiu6t, p:3o5+z 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 pau3 k+ztikl jp 6:,i5ooths best indicates the trajectory of the mass?

  13.29 Two electrons enter a region between charged capacitor plaex -w9/ls ovw9/x9ea- 5f ijmqtes with equal speed v. Elecw- qv/awsf 9jx e -lxe59i9/motron 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 on a negative p im6ribl2v5f3; p2vxf oint cr; f2bmvv6 p2lxfi53i harge placed a distance x away. If the distance between the two 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 are separated by a distanjgmx.8*qrwf4i +pp4p ce R, the force between them is 4fgj+qppm*4 8xp.ri w F. If the distance between them is quadrupled, the force between them is

  03.18: Two identical electrical point charges Q, separated by a distance produ7h r0iby f(f3+wymm 9lce an electrical force ofF on one another. If thimbf+yh 3m7ywr 90(l fe 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 akl 18 6e.iaitpoint charges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of the force on tha.li61kai e8te charge +q is:

  01.31: A positive point charge of +q and a negative poguzfsjvud+f :t m89.;int charge of -q are separated by a distance d. What would be the magnitude of t; :j+8ut.f9zuvdmg f she electric field midway between the two charges?

  08.33: Two point charges are fixed on the x-axisemhmf64 3tv 0/0dya-t;vg 3t yy nxjw8 inotherwise empty space as shown below. d033gn /hx6wtavmjeyyv fm-; t08yt4
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 in3s0u8n;u-br7i af 9jlko/lk/y 5 afao otherwise empty space as shown;9nska3i u/0 fro a o5 7y/luf-b8jlka 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 –j3llzed:l9 k)ee* pc* 4Q are arranged as shown in the accompanying diagram. At whic*epz ej9l: *lecdl3k)h of the labeled points is the field most nearly zero?

  98.30: Four positive point char2.8bu k fqile0ges are arranged as shown in the accompanying diagram. The force between charges 1 and 3 is8k .i ue2l0fbq 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-ugr5)a 9, qpsuaxis 0.20 m to the left of the origin, as shown in the accompanying figure. A second point charge q is ru,uq )p5ag9s 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 pointzp4gmk r2vz*95dvgh+/xm 2r s 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 positive x-axis 0.30 m to the right of the origin. The net electric potential at txm *gk2rzm4rzpg h/s+2 v5vd 9he origin is also zero. What is q’s charge?

  03.27: Four electrical charges are arranged on the cornercd/cd 8rzb25 gs of a 10 cm square as shown. What would be the direction of the resulting elezb5d g2rcc8d/ctric
field at the center point P?

  14.10: Two charges −Q and +Q, are fqddc c,jp h -7c8x7ip0ixed in place on the x-axis, each a distance a from the origin as shown. At the point labeled P, p7x,ccdhc8 idq07 - jpa distance along they-axis from the origin, what is the direction of the electric field from the given charges?

  16.33 Given the configw o/xzvr.54bq e8r-ej uration of three charges, +Q, +Q, and −2Q, which one of the rj4zrb/- 5qox ev.e8wfollowing 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 charge Q, and a charge per unit rk*db+ d5:ger lengt+drr5d:*b g keh given 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?