95.26: Two positive point charges re.o0w)u / qtieopel each other with force 0.36 N when their separation is 1.5 m. 0iteu w)oqo/. What force do they exert on each other when their separation is 1.0 m?

  12.13 Approximately how many electrons must be rem lyrn.(p/ br)ncp1ok 5oved from an electrically neutral object to give it a net char npr1./p5)kbnc(o y lrge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizom;3 g4teem -a h3hxgz:ntal wire produces a constant current of 3.20 A for a time of 3.0 hour. Which one of the following choices best represents tht:gzxegh e3;am- 34hm e 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 k 5;4q4g nr7 yebwg5r eca5 wg;hc*a7w0.50mapart. The electric force that one particle exertsg7g5 4age 5yewr5k; wbh;rc7wq4 cna* 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 r/:n xm.8 y3p tvus7mmfatio of the gravitational for:f /.vm3pm xusm 78tynce 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 experiment with a proton of charge Q and m6 4w8ht *qzvp(ee ys;wass M being placed near a helium nucleus (2 protons and 2 neutrons) of charge +2Q and mass 4M. The objects are each releay s h4w(;vpz ew8e6*tqsed 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 weightz1efp2s6nieufjv38:/ :k z wc 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 2scu/3fje:1 n6fpzz 8vke: iwa 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 2an: /eb2ok c9tfb v*j charge Q is connected to an insulating m *kojbt v2nc eab29f/:assless 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 capacitor plate*6og g. wsq50c0ygy9n g zkia pxzri1-j2yw61 s with equal speed v. Electron A is dijgg0w516 y zs *9z1.co aii0g qp wk-6n2yygxrrected 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 neu056dq iymq4 nxv1)w wgative 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 that the positive point charge exerts on the negative point charw4qnv q ydm)10wx iu56ge?

  98.08: When two charged point-like objects are separated by a distance R, ; b.e bv b5w9wx3uzc. uuh(3qdthe force between them is F. If the distance between them is quadrupled, the force betweh3 3uu(bxqucwvb.we5;z9 b.d en them is

  03.18: Two identical electrical point -/et d67vatsj charges Q, separated by a distance produce an electrical force ofF on one anotherdt7 eat -6j/sv. If the distance is decreased to a distance of 0.40, what is the strength of
the resulting force?

  96.34: A point chargef+a7 9i+,a3 mnkgqx xu +q is placed midway between two point charges +3q and -q separated by a distance 2d. If Coulomb’m, g3q xak+xf7i+au n9s constant is k, the magnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a negative py(+ yc1qjfw5w02y0 t zmhtd c2oint charge of -q are separated by a distance d. What would be the magnitumc2jdy0(t 2tyh+0zwc1w5q fy de of the electric field midway between the two charges?

  08.33: Two point charges are fizo+ bz / i0c+ ryxizfx89fh/g:xed on the x-axis inotherwise empty space as shown below:hof z0/zfbgxii y98c+z/r+x.
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 f /h ;.s-qgjhgtco0b0msn.:d jixed on the x-axis in otherwise empty space as shown hs.hc g-t0sqmo:d;.jb jg /n0 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 /2hw ynq.j*fc 0q8 v 3hakwqy 0xiv(s8and –4Q are arranged as shown in the accompanying diagram. At which of the labeled points/s 0 0i n3w2( q k88qqyvycj.axh*vwfh is the field most nearly zero?

  98.30: Four positive point cho j;7rv3l(jv yarges are 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 mag(vr j7o;yj v3lnitude of the total force on charge 3 is most nearly

  94.08: A point charge of +4.0 mu5g9qo4f1 q8,6g wfkybni 5 e μC is placed on the negative x-axis 0.20 m to the left of the origin,fgwu89gnq q,iey 5mf6bko41 5 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. What is q?

  95.36: Assume the electric potential is zero atn n)h)8 nn up ywpku9c)mb27w+ 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 second2n9n)mbpuy u+7 p) 8wcnwh)nk point charge 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 the corners of a :-u*lb;wnvrd 10 cm square as shown. What would be the direction of the resdv r*;u bwl-:nulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fe:trnay;x;um zd6* xq6/ b 2tkixed in place on the x-axis, each a distance a from the origin as shown. At the point labeled P, a distancetrd u6kx2 yxb:; q6a;e/*z mnt along they-axis from the origin, what is the direction of the electric field from the given charges?

  16.33 Given the configuration of three charges, +Q, +Q, and −2Q, which og7z t9h6xc oj-um 8bi4ne of the following choices best represents thexhg u976t-zi oj8 cbm4 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 lengtqhn65j+se ,bjeq g p)+ mm-n7ih givej+i-qhe ,pjq)mn76g5b e+ mnsn 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?