95.26: Two positive point charges repel each other with force 0.36 N whenbj,cis7k* - al their separation is 1.5 m. What force do they exert on,jibcak l7*- s each other when their separation is 1.0 m?

  12.13 Approximately how many electrv 4pd4wsyr sby 1y7-wm3gc7+rons must be removed from an electrically neutral object to cyr 3 b747s+mgyw -svdyrwp14give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the f4z:oj8pvufdogdl+ efa1 t4e,03;b ug low of 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 that pass through a vertical cross-section oveuj,p o8g3f4ad;u+e z 4b tdfo1lg0:f the wire during this time?

  13.07: Two identical zbq( xzncpj 4l .x ;by8.h;:)7fvkhaxparticles are fixed in place a distance of 0.50mapart. The electric force that one particle exerts on the other has a magnitude of 3.00 N. Which one of the following ch ;: zx;n(hab4.qy.7 cjxf b k8lx)zvphoices best represents the magnitude of each particle’s charge?

  07.25: If two protons are otw;lhcey4m t s (pq+t**l wmpl z1/03spaced by a distance R, what is the ratio of the gravitational force zhlwtmw43t;tpeql (ms* y +/o l01pc*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 h)2*7colf koxa 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 releasedx *lo)7 o2chkf 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 weight v(51w: juurrxgb0a56 0q +r p 9wfalihmg 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 accompanying fig wr06uxr1vu5p5hw li(af+ gajq90:brure. 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 z-;p6hmx d5ec uk7a(uis connected to an insulating massless string in a vacuum on Earth. A u6pakzm(;hecd7 u- x5uniform 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 capac prxsqe j6h.12fg7:apeey 37titor plates with equal speed v. Electe2:qegxep t3hs pr 1.y67ajf7 ron 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+cd kekif 1v3 i63n0ni force of magnitude F on a negative point charge placed a distae1i6vcn+ 3fkiid nk 30nce 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 separated by a gdzfvxf+ s ),imj -*m/p l/j 5ejmz9q2distance R, the force between them is F. If the distance between them is quadrupled, the force betz2 -z)ij/x fl +m vjmf/ gd,*jsm5e9qpween them is

  03.18: Two identical electrical py ,k he8e f/dbmoc,pv.9 :ukm8)tn*ihoint charges Q, separated by a distance produce an electrical fo9 cki*.8e:,bf /uohdmt mv,8 pyhkn)e rce ofF on one another. 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 +3q and; +;keae /thmp7uvbie b4.y1 p -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of the force on the chk7+bpe e1/ 4pmut ;av;heybi.arge +q is:

  01.31: A positive point charge of +q and a negative point charge oea+ycl2mw 23bz 2--ex7ohv: p braa s*f -q are separated by a distance d. What would be the magnitude of the electric field midway between theb2*v lyz r2p -hsacw em7o23:+ax a-be two charges?

  08.33: Two point charges aqb5fq 6oz;q (5f+sue cre fixed on the x-axis inotherwise empty space as showneq 5cq6+szu(;o 5qf fb below.
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 space as sho t8w u-2,e vhjcs.kyyex*1 j, w99zmapwn betc1.w,k*,avjpsx 8h9yz2-emy e9 jw ulow.
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 diagramk ;-orp8p eiw5s/bu9o. At which of the labeled points is th-8r9e s k/o po5pwub;ie field most nearly zero?

  98.30: Four positive point charges are arranged as shown in the accompanying dia nm /2p9 iqy/jc12kbgagram. 1 qjpi2m/c9/g a2ynkb 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

  94.08: A point charge of +4.0 μC is placed on the negative x-axis , +szx7-b)q k89eq nzwjubb r y2qjx.+0.20 m to the left 2)y-e,qjwb j sr8u++q z7knxb9 qb. zxof 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 at6 j jykvh4*c:yw+ 1sy4om 9llt 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 poiyy4t: *49 wly s+lmjjok61vhcnt 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 10 cm square asr/x1h8tkt- *nh-x g ew shown. What would be the direction of the resulting e/8 hn1x -k-thgxewt*rlectric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis, each a distance zk*c:ecz c;/my x v4r9a from the origin as shown. At the point labeled P, a distance along they-axis from the origin, wha zv/yzkc4*r:x e;ccm9 t is the direction of the electric field from the given charges?

  16.33 Given the configuration of three/rbu8 , l,7i yyjf:tlj charges, +Q, +Q, and −2Q, which one of the followingrljy:/i yf tju,8,b7l choices best represents 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, totafu)n ht3 45hfal charge Q, and a charge per unit lengtf4ah 5ftu)nh3h given 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?