95.26: Two positive point charges repel each other with forc-retkxf bo ta0h)+f 64j 0i3swe 0.36 N when their separation is 1.5 m. t3-oetr 4 s+6)ikw0b a 0fxhjfWhat force do they exert on each other when their separation is 1.0 m?

  12.13 Approximately how many electro3ehj ,9q3qm wfns must be removed from an electrically neutral object to m,wh33eqfjq 9give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horioo cvc2a/60wvv. : la +klcq;rzontal wire produces a constant currvoo a6a+/.ckcrq:vwlc 20; vlent 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 of the wire during this time?

  13.07: Two identical particles are fixed in place a disk. oplkxahrm4 g7fgjy1 1xj,mu;c3;d-pvp 6; tance 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 choices best represents themk,4g;okcl jx6mpfrupp 7yd v . ;jga x;h11-3 magnitude of each particle’s charge?

  07.25: If two protons are spaced by a d r wv 0(pc2mt:)k1baohistance R, what is the ratio of the gravitational force thatk h0ocb):p(a2 w tvm1r 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 wrd/5o0c(4dr sl 7agyc2o t/ogith 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 electr 4drg aty5og 7 /c0cl/oso2(dric 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 mg is attached to one l w5db3zri f.q;foy45end of a string of length L. The other end is attached to a stationary support. The system is placed in a uniform ho.zrbf5 5idw;qof 43ly rizontal 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 mntq 7q ovhxd +p)b;p;4ass M and charge Q 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 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 masqnbx4)hp;qto+7 ;pvd s?

  13.29 Two electrons enter a region between charged capacitor plg11mm.7:monm4s xstoates with equal speed v. Electron A is directed horiz o1m4o x7mms:.gmns1 tontally 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,(dco *:kuwu0gdk ra4zcfzv4+bbj /2 a negative point charge placed a distance x away. If the distance bezzc*a,42u40v+f wdk/bo(:bdkg ju rc tween 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 obw37roj j zw2-wivn+87 ,t irueu7,jcel l e/l*jects are separated by a distance R, the force between them ivl+ ow7/7i*lw, z8ij,w nljeer3 jtru 72eu-cs F. If the distance between them is quadrupled, the force between them is

  03.18: Two identical electrical point charges Q, separated by a distazi t7.5n6xek xcf*o j8e5b- 9c1kspvhnce produce anptcnb8 zok7skevc9j x6.f-5 hxie51* electrical force 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 m x p*vwbqegl7-i y3t74idway between two point charges +3q and -q separated by a d -i*77 lv4 wpbqtxegy3istance 2d. If Coulomb’s constant is k, the magnitude of the force on the charge +q is:

  01.31: A positive point*1dwjkrjq *msi .bo1 - charge of +q and a negative point charge of -q are separated by a distance d. What woib 1o*j km*- q.rjds1wuld be the magnitude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on the384qcg)vskm d x-axis inotherwise empty space as shown below.gksv dm)c4q83
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 8 +94gxl 2wja;il u,jwfoqi c4are fixed on the x-axis in otherwise empty space as shown bei+ 4lx,jj aui84 cw2;9 oqlwfglow.
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 di/*075q k ex4gcl dpn.yul 3ewzagram. Atg7p 0y ule/cl*wqn3xkze5 . d4 which of the labeled points is the field most nearly zero?

  98.30: Four positive point charges ajtv eur7ts. j)/;vznmnyn)j,4k2(9ciw o o9nre 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 o4u 7 ksy9n. cnz ovr njn(t)t/wmi;9vj)eo ,2jf 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 0.20 m toueg5 dzudcct)ped16 +af 3m z.7 xy1v+ 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 right of the origin. The net electric field at the origin is zero. What iepua z+ dt cf yx5736zvde)c1.gdm 1+us q?

  95.36: Assume the electric potential is zero at infininrg7k gjzw101ty. 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 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 origz k7r 11n0jwggin is also zero. What is q’s charge?

  03.27: Four electrical charges are arranged on the corners p k;d+ dwm+8 mzk(fp2azee6e6of a 10 cm square as shown. What would be the direction p e 6e6 mk+ezp;mwdk(+adf2z8of the resulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-a 56turm :*fs6oc9o-:zu fepf sxis, each a distance a from the origin as shown. At the point labeled P, a distance along they-axis from the origin, what is the direction of the electr6ffzp 6o e*u5c osf9 us:t-:mric field from the given charges?

  16.33 Given the configuration of three charges, +Q, +Q, and.h;fxtqygw*a,d; :s, hlhj c, −2Q, which one of the following ,lhjta dg,fqh,;y.c:wx ; h*schoices 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, total charge Q, and a charge per unit lenua lt57,p x-xr1z3:u, cmuv pvgth given as txr1 7,:vpulv cu53z- u,mpxa$λ=λ_0cosθ$ 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?