95.26: Two positive point cha5mkp-;h01ot sy hctda,a u8e 3rges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 8my dkhhupa t01stao-ce3;5,1.0 m?

  12.13 Approximately how many electrons must be removed from an electrican+ ,6ou:w3axx h,wvx jlly neutral object to give i:ow,nj,wx 3vaxhxu+ 6t a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal wire produces j4a)l8b j(nxr a constant current of 3.20 A for a time of 3.0 hour. Which one of the following choices best represents th4)ab x (n8rjlje 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 0.50maparthdgj9m9r 06i(c rz6gx. The electric force that one particle exerts on the other has a mag6g9h0rix mc zjg9d(r6nitude 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 ism)ty d;( w, hq/):w/4e bowdimf; wcjw the ratio of the gravitati)4 d yowwwbqt,im (/;)wdm;ejcfwh/ : onal force 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 g:a5m 8z4iv1 pyhag kn9tl67.o/b8v w5 gi mehmass 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 exp9 e6v/ot5kmag myvi:gnbz gp5 l. 81hwa8 4hi7eriences the greatest magnitude of acceleration? Ignore gravity.

  94.39: A small object with charge q and weight mg is attached to .ku (a+z,5 ;:hvjogeu6x u mnlone end of a string of length L. The other end is attached to aghanku xzl:m; u +6.o (jev,5u 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 +wl: 5vw9 t)n)awmuqiQ 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 w )qwlwt59 i:mv na+)uof 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 plates w37ka(7eisag 7q 5z;d+s-jve bdo y.uvith equal speed v. Electron A is directed horizontally to the left while electron B is directed7(zy -sose5+a kidvv g 37badjqe 7;.u 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 ma -1ff ijgb. 5wez aa(.00pbqpggnitude 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 that the positive point charge exerts on the01(p-50bgqaw.eb f ijgp. azf negative point charge?

  98.08: When two charged point-like objects are sepcmv-dwd84qgfr5 +j 39 so2 hkvarated by a distance R, the force between them is F. If the distance betwe-fvo jk 3s9m4dw+dgc v 25rqh8en them is quadrupled, the force between them is

  03.18: Two identical elect fgpgxghq, i/8o5r(i ,rical point charges Q, separated by a distance produce an electrical force ofF on one another. gqhg,5rp/8f, g xioi ( 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 +70ovq fa8 fhml5ui 8tjn.m/,m0w nrf/3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnituvnrq.fj58wtnfulom7,a/ 0 8ih mmf/0de of the force on the charge +q is:

  01.31: A positive point charge of +q and a negative point charge of;f nww4x 9;iuhbo/ 3wz -q are separated by a distance d. What would be the magnitude of the electric field midway betwezfo4w n 3uw; ih/x9w;ben the two charges?

  08.33: Two point charges are fixed on the x-axis inotherwise empty space as sh 8uai 4*/sqvdn.ant8btls:r (ns04d vown *ss:084 t tau4 d.nv qd(biv8n/nalsrbelow.
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 empty spadhos,9vo 0fp3z 1: qpuce as shown belpof19:o zh30q, dvpsuow.
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.hj/ cv85u tn ;xre*p lrru9;v the accompanying diagram. At which of the labeled points is the field most nearly zertjrpc8*urvxe 95;; nl u.hrv /o?

  98.30: Four positive point ch fvd*yd kz8bimxm0e 53v9 n)c,arges 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 magnitude of the total force on charge 3 is most nearly m3yv8f z* ke ic,b)d50dmvxn9

  94.08: A point charge of +4.0 μC is placed on the pn-fg y)pj4/n negative x-axis 0.20 m to the left of the origin, as shown in the accompanying figure. A second pg/- ypnjpf) n4oint 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 at infinity. A point cha zb58 a.6/ m:i(cg7 uqaipcpovrge of +4.0μC is placed on the negative x-axis 0.20 m to pc6/ avozg i:cu i5bm.p(7aq8the 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 the origin is also zero. What is q’s charge?

  03.27: Four electrical chargesa1b;daygl9ri o4-qjw u atsl7v/,3x9 are arranged on the corners of a 10 cm square as shown. What would be the direction of the resulting lu9;gxrb9a a dt , v4/-ysljw 7i3oq1aelectric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis, ea(l azoo*o8wo l s5g3lg. 96bh;umu5krch a distance a from the origin as shown. At the point labeled P, a distance*g9.la 5ou5ou mrz; ohol38ks(bg w6l 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, +d otz/b,hq.k .Q, +Q, and −2Q, which one of the following choices best represents the direction of the electric field at.hktqd /o. ,zb 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 cha0id0co(osjg 8rge per unit length given(djog00os8i c 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?