95.26: Two positive point chakq okcvm e92r t22oa-t-,41qpi pa5xrrges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on eac429akr kx paqt - 212eqop5otm-cr i,vh other when their separation is 1.0 m?

  12.13 Approximately how many electrons must be removed fron, g5cz uca 0hk/8-ybum an electrically neutral object to give itkb50gy 8 ,ucucza-hn / a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a 3j x.3k* q dwiv:rmo ykiqm0+:horizontal wire produces a constant cik. qdwmjy+33qo: v : kx0rmi*urrent 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 cross-section of the wire during this time?

  13.07: Two identical particles are fixed in place a distance of 0.50mapart. The wgppm42j eta: 7t:, iqelectric force that one particle exerts on the other has a magnitude of 3.00 N. Whichpi4tpt meg: ,7 2qw:aj one of the following choices best represents the magnitude of each particle’s charge?

  07.25: If two protons are h.*(hwd1aupzov. o5owr4 z:t vq0i6 e spaced by a distance R, what is the ratio of the gravitational force thati d0 th wr5wa(.e 4voqoozu .hp6v1:*z 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 proton of charge Q dh+1d-fik uw1and mass M being place+h iu1dkf1 dw-d 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 magnitude of acceleration? Ignore gravity.

  94.39: A small object with chaycf 2:4a icfil20+ w;axex +zsrge q and weight mg is attached to one end of a string of length L. The other czlciif y2;x 0e2w x4:f+s +aaend 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 vertical. What is the sign and magnitude of q?

  09.38: A small object of mass M and charge Q is connectedzm/qikjz 6+ t2 .u;vsqzsxa (5 to an insulatins2jvz6.u (zi;x 5a+qtz/ s mqkg 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 the mass?

  13.29 Two electrons enter a region between charged cap0df z1k q;lhl2acitor plates with equal spll0khz d;qf12eed v. Electron 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 negme9 aiy.)zuc brv ;;d(ative point cha;bad;uc (v)zei .9myrrge 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 sepa l nbe( 2,,oo+i, /j(uviti ucg3rrel,rated by a distance R, the force between them is F. If the distance between them is quadrupled, the force bo ior,(iie,v t uln3+/cl2b(g ,urej ,etween them is

  03.18: Two identical electrical point ch4) fl5odw;z .sppb;u darges Q, separated by a distance produce an electrical force ofF on one another. If the dist5;u)p;p w4.fslbz oddance 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 bet8sng-tp38b-wa 4p8kosr/a4zm mw/ cbween two point charges +3q and -q separated by a distance 2d. If Coulomb’s constant is mp - ab3saw 8smz8bw/c8gn t/4kro4 p-k, the magnitude of the force on the charge +q is:

  01.31: A positive point chargea-ids on*syj8.gf axb/tv+(6 of +q and a negative point charge of -q are separated by a distance d. What ws 68o/(+b ft*ajv sad -ngyx.iould be the magnitude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on the x-axis d r:sw(2.pj 8rcv7anqinotherwise empty space as shown below.(:w 7dsp qjrna 8crv2.
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 n 2wy,.8h c6k x.bw r/4atqtkeempty space as shown belobkny4 6w.e ta/rk h8.2qctw,xw.
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 wz02rj1chrr)diagram. At which of the labeled points is the field most nearly z)2z1cwr rhrj0ero?

  98.30: Four positive pq1a6hf : 0xqr 7tz; smpdfcc+d p04kb8oint charges are arranged as shown in the accompanying diagram. The force between charges 1 and 3 is 6.0 N; the force between t +pd bah1:0mcq; kqdpz8f60c fsx74r 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 negativefaro1p;3 ,v rf 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 the origin is zero. Whata3,v 1pf;ror f is q?

  95.36: Assume the elect esco h;ep0y;0 im:,jfric potential 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 figure. A second point charge q is placed on the posi,e :m;copjhs0i f ye0;tive 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 w( ij* gdy3 5esimg1/uof a 10 cm square as shown. What would be the direction of the resulting electrig* y1ms(ug 5/3iiwe jdc
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-ax8o hz: um(t.zqis, each a distance a from the ou .:zhomq8t (zrigin 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 configiegj 5 :rj+mh+uration of three charges, +Q, +Q, and −2Q, which one of the following choices best represents the direction of the electric field at the point P and the sign of the electric potentia+ rj jmeg5hi+:l at P from these charges?

  17.43: A semi-circle has radius R, total charge Q, and a charge per unit len o0c5 x0xw9nqugonei/g x4p 92gth gq/i0o 4 xx9wn259 e gn0upcxogiven 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?