95.26: Two positive point charges repel eac4q-j3w2vl6 o)db dbrnh other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their s2v-q bbl drd43j)o6wn eparation is 1.0 m?

  12.13 Approximately how many electrons must be removed ngi-wy8)) s e ,lcoo7pfrom an electrically neutral object to give it a net charge oo)oicyles7 g- w )n8,pf Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons q0jf.,zmei/t(ew5w iin 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 that pass througjtqi e.,i fm5/0( wewzh a vertical cross-section of the wire during this time?

  13.07: Two identical particles are fixed in1kg uzv(my-g ) place a distance of 0.50mapart. The electric force that one particle exerts on the other has a magnitum-z )(yvkgu1 gde 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 ratio oglwtfz 4a pf0yb:;0x.f the graviyz04l fwpfb t;.xa0g:tational 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 massdzw4mq21 9,p/ak :gzys o m7lr 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? 2 krm:d g/zpmlyqs,z7 o 9w4a1 Ignore gravity.

  94.39: A small object with charge q and d ,d1)8ye1a7qtvwlmg bp-bl8u 3qme 5 weight 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 electric field E, as shown in the acm) davmt35ly e -up81gq7d1lqwbeb , 8companying 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 insulakmtt:i sx7()chnd- ot z(0y-wting 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 equih:wn7xk(m )-tz0tcd- yis( t olibrium 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 with eq ed;(ymsad.4w+) ;wu9ohu ppqual speed v. Electron A is directed horizontally to the left while electron B is directed e.y hp); d(wqdu u4moaps+ ;w9at$30^{\circ}$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 poin 9n73 vgas3kiqi*:nmst charge exerts a force of magnitude 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 the negnim i3ag:*k s3s 9qv7native point charge?

  98.08: When two charged point-like objects are separatedda +5ukqnlq(d 01jl cfnx v194 by a distance R, the force between them is F. If the distance betwe k 0vc(n9 lxad54qjq+du 1lfn1en them is quadrupled, the force between them is

  03.18: Two identical electrical point charg3d7k by pko-a7j/hi2z a 3j.wxes Q, separated by a distance produce an electrical force ofF on one anoj.73 pa 23 wo/xd ky7zkbhaj-ither. 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 ah*d-our6t;yn9gwcv6 jb28-om2d kv u :dqp8placed midway between two point charges +3q and -q separated by a distance 2d.g wjua8kddvcn6ovb*rt2qd 9ho6 y:2mpu--8; If Coulomb’s constant is k, the magnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a negatix wn5 l6uni zruud0-,6ve point charge of -q are separated by a distance d. What woudu5iulz u -60r,nxw6n ld be the magnitude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on .pt9 wchtcoiz 9z28y)the x-axis inotherwise empty space as shown belzc.8ywo i9z9pt )c2h tow.
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 xcm5etpn p40ntcu2 ,.( (meajz-axis in otherwise empty space as shown becm pp ,a(2neze.m5j tc0nu4(t low.
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 7rh512:1 rurmn y98egmv ngdr–4Q are arranged as shown in the accompanying diagram. At which of the labeled poinyr2r m7h5n81ugdmnrvre1:g9 ts is the field most nearly zero?

  98.30: Four positive point charges are arranged as shown in the accdks i /dkg c6q9,aat8dp4h:rz-2dln 7ompanying diagram. The fo486sl92d:qc ,pa-i d tnh /dzdg 7krkarce 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

  94.08: A point charge of +4.0 μC is placed on the negative x-axis 0.j7nn*j pu;aeb7hi2b7 ke:/ 3wc(p bzy20 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 rwjc2n:uy;n ikzp77b/ jabbph7 3e(*eight of the origin. The net electric field at the origin is zero. What is q?

  95.36: Assume the electric pe( yesxeu;u*214 fryr otential is zero at infinity. A point charge of +4.0μC is placed on the negative x- f y4eeyxu 1r*r2u;(seaxis 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 zero. What is q’s charge?

  03.27: Four electrical charges are arranged on the corners of a wcyr,* v7a*8u dl i3 f4xtu0ns10 cm square as shown. What w873lvcyx *tra4du*s 0unw ,ifould be the direction of the resulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in placea*i v-4c/zgaa on the x-axis, each a distance a from the origin as shown. At the point labeled P, a distance along they-axis from thz* a-aa/ vcg4ie 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 one ofk vh a0n:jhd09 the following choices best representsv09jn hdkh: a0 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 ua z2(zcrqg+2q nit length givenrqzq2za (c+g2 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?