95.26: Two positive point chargeg nu9c5;8sgcq)gm kr5 s repel each other with force 0.36 N when their separation is 5cqg)cng5 ;rg smu8k9 1.5 m. What force do they exert on each other when their separation is 1.0 m?

  12.13 Approximately how many kvi tzzsoiq67l3 au;+q t32r 4electrons must be removed from an electrically neutral object to give it a q+kti r73 v4iq3zztu; 2ls6oa net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow ofdbr++6kw v1l(ko ngt 3z+ik .nq0 ;ypd electrons 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 thaz0lydbd3 kto wg(n1 rnvkqi+p; + +6.kt pass through a vertical cross-section of the wire during this time?

  13.07: Two identical particles are fixed in place a distance268m;de-cyb bpq *hkz of 0.50mapart. The electric force that one particle exerts on the other has a magnitudeb6;pzc 2hm 8*dq-k ybe 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 spnm7 3rxd. v;6kbi shse 48znp7aced by a distance R, what is the ratio of the gravi8dr4;b s6nizesv 7hx n3 .7kpmtational 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 setf )ota.t8 3uhx:0qozyk6q s2l7cusx8 s up an experiment 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 force from the other and which object experiences the greatest magnitude of acceleration? Ignore gravity7qf)8 u koc3tst2aq6ou xsh. 0 y:xlz8.

  94.39: A small object with charge q and weighgtqw-pf:xurvc o f (9. ii(7:lt 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 unifoxgoiq (( :t:f lc-u7wi9.rfvprm 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 connected to an insulkz*rn+0w o h5oating massless string in a vacuum on Earth. A uniform electric field existso*zohkwn5+ r0 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 plates wi9cb0 n19hw-86tpvxdoqsx:7k puz6 jh th equal speed v. Electron A is89x vz0chu6k6oxpd7qbh 9ns:twp j1 - 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 exert h l3g6ndxmk.)s a force of magnitude F on a negative point charge placed a distance x away. If the distance betlm hxkn dg6).3ween 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 objectrka571q:tmfiw s).9)gfq+mic ykkn v )k(lz5s are separated by a distance R, the force between them isi)ifz7 5 qnk( tw).kq 5cf1kygmr9) vskml +:a F. If the distance between them is quadrupled, the force between them is

  03.18: Two identical electrical point charges Q, separate az,igwo99,sbgqzq.a/ l :0ehf8 dt r+d by a distance produce an electrical force ofF on one another. If the distance is decreased to a dist:qozl9er8+iqa.sa,/g9f dg hw,bz 0tance of 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway between two poin8r f(:zjx- v3dw8qj-pguakn) t charges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of the z (3 w8f-)a8gx-rnj kjqvdup :force on the charge +q is:

  01.31: A positive point charge of +qly 2g9,vd)q*/cqv1y 9ppv mwa and a negative point charge of -q are separated by a distance d. What would be the magnity/p av* qw)q2dl gc 91vvy,pm9ude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on the x-ajcljwlibc g1b10z3u28+n by; xis inotherwise empty space as shown l icy+2lgu11n 3b0 j 8;bbwczjbelow.
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 empuauk7-o1da) y ty space as shown beu7aao k)- 1dyulow.
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 m1 (xb.eh6be25z sv aims-g1kdiagram. At which of the labeled poinbsk.(bsmg em x51v-21aezhi6ts is the field most nearly zero?

  98.30: Four positive point charges are arranged as shown in tyt 5e 1a6 9 tvpsv;te-dp-cmn0tx3ak 7he accompanying diagram. The force between charges 1 and 3 is 6.0 N; the fdsa;et7 x9 n--v mpta 0t5 k6evt3p1ycorce 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 negad8: / )fof+w mo:ikczhtive x-axis 0.20 m to the left o/di mzo+hf 8o:f:wck )f 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. What is q?

  95.36: Assume the electric potential is zero at infinity. A point charge of +g5v,mrefr0 ao7+. nhj3o w9 mc/7 ujtj4.0μC 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 the origin is also zer.mcej9f5 vmo utwg/+7 rjr3h0,7 noja o. What is q’s charge?

  03.27: Four electrical charges are arranged on the corners of a 10 cogrtd)gon * 22sd:n i4m square as shown. Whioo n4:)t*g 2nrdsg2d at would be the direction of the resulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis,xb70 npu :f:gilvvrbdy 0y4 lbf5 66h, each a distance a from the ofrlhgfu06v yvp5y 64nib7l,xbd 0::b rigin 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 configuration of three charges, +Q, +Q, and −2qm0nu85+ gna4uvw7pow ze3;rw 1 l* sbQ, which one of the following choices best represents the direction of the electric field at the point P and the sign of the el5s7bng1 vpu 3 a8e 4+nr ;mwowq0*wuzlectric potential at P from these charges?

  17.43: A semi-circle has radius R, total charge Q, and a charge per unit lentewcajba q1rh3() 65v0.tb: 8q ulkjhgth given as :vuatkbq1( cwh.a80elqh j3 )b t5r6j $λ=λ_0cosθ$ 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?