95.26: Two positive point charges repetjt96egwt udtq:/ br57f1rd( l each other with force 0.36 N when their separation is 1.5 m. What force do(dbr:j16q tfdut tt rw7e/g59 they exert on each other when their separation is 1.0 m?

  12.13 Approximately how many electrons must be qq2j.i3u;iq4edy/j) xwr5e u removed from an electrically neutral object23 ue)ryi qjjq dei54x;qw/u. to give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horiz*n 2s em*4kgve0zz9pcontal wire produces a constag0kz9n zm4 *vespe*c 2nt 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 of the wire during this time?

  13.07: Two identical particles are fixed in place )u zvo bfb:2 ;kn9s5dma 2g4wga distance of 0.50mapart. The electric force that one particle exerts on the other has a magnitude of 3.00 o gdu vn2f 52awb9)g;4kmbz:s N. Which one of the following choices best represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced byy7b 0+5x)i xqgu og8zkythr06 a distance R, what is the ratio of the gravitat0+7uxo8r y6 k ghgybzit)5 xq0ional 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 experimg(8wds0w q :vpent 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 m0qgvps8 w: w(dagnitude of electric force from the other and which object experiences the greatest magnitude of acceleration? Ignore gravity.

  94.39: A small object withai8-:30tuur3icp ydh charge q and weight mg is attached to one end of a string of length L. The other end is attached to a stationaryd:pur-a803 i yuti3ch 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 Q is connecte7 2bsfm2p 4cwk( a xh,5-n;nfnb-xjacd 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 illustraten xs5aa pc w,2 ;c(n2hbf4 -bmk-j7xnfd paths best indicates the trajectory of the mass?

  13.29 Two electrons entalh3x2h 7r (lbkh4u+jheh xn4e;fdmey/m --0er a region between charged capacitor plates with equal speed v. Electron A is directed horizontally to the left while ehm0-r7 23h j4-ehml+k(nhxf e h yu4lx/db; ealectron 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 a3( q)w5f hh gsuwp/pa3-hh. dr negative point charge placed a distance x away. If the distance between the two point charge/3 pph).-fdrga w3hh (w5uhqs s 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 separateiy8c-r0 x5mfoh j cwo /92en5fgnp)b.d by a distance R, the force between them is F. If the distance between them is quadrufh5 8r cn5iog p.b n2j)ewxcmf9o- 0y/pled, the force between them is

  03.18: Two identical electrical point charges Q, separated by a d7 d cq(.kkl6eyistance produce an electrical force ofF on one a c(6ykk qel7d.nother. 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 gpnv9 we./-wa midway between two point charges +3q and -q sepav.aew/ - npg9wrated by a distance 2d. If Coulomb’s constant is k, the magnitude of the force on the charge +q is:

  01.31: A positive point charge t/mqz5.v 1eqxde/ s0sof +q and a negative point charge of -q are separated by a distance d. What would be the magnitude of the electric field midway bez.1xs/te qv e/5dqm0 stween the two charges?

  08.33: Two point charajx;e/4g 1gn eges are fixed on the x-axis inotherwise empty space as shown belexn; agg 1j/e4ow.
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 otherwisq:sm fub8e5*2 dv.z2fw/sye 4az1x wae empty space as showne5xwy1 az8s f d2e vb*fw/u2ma.z q:s4 below.
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 accompanyiv8wx *kvux4 4dnf(xgt7. sx- zng diagram.4 u*fvxgksvx 8 .x7-dwt(4xz n At which of the labeled points is the field most nearly zero?

  98.30: Four positive point charges are arranged as sho qx.zvexq ggz m f7nv9063y+q/p,* zerwn in the accompanying diagram. The force between charges 1 and 3 is 6.0 N; theq9/3zx 7xqer vn6*z y +zg0fm.gv,qpe 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 +4ojf +4+s9f pldw5 w/vp.0 μC 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 mto the right of the origin. The net electric field at the or5 w/jpwdo+lf +svp 49figin is zero. What is q?

  95.36: Assume the electric potential,c+ :rzxhk1 kkqtqcq-3 7/hph is zero at infinity. A point charge of +4.0μC is placed on the negative x-axis 0.20 m to the lk k17+z-:,/t3xc hhpcq hrqqk eft 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 10 cm squareuqd gl4d4fq r7/r qb7l*i 76iq as shown. What would be the direction of the resulgdl*476q7r/dui fb 4riq7q lqting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis snr9ma1ia 75v, each a distance a from the origin as shown. At the point labeled P, a distance along tvm1 ns7i 9ar5ahey-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 −2Qjp- fv-;hhu9 i, which one of the following choices best represents the direction of the electric field at the point P9hviu;f-p -j h and the sign of the electric potential at P from these charges?

  17.43: A semi-circle has radius R0g8p4 yw es(y*afdd8r, total charge Q, and a charge per unit length given*pfr eyasg(wy 0d8d 84 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?