95.26: Two positive point charges repel each othsy:dlpj fox3l7ccpk4:5 .z 3c er with force 0.36 N when their separation is 1.5 m. What force do they exert on each other whendj .4sofkc y:7lpc335z x: lcp their separation is 1.0 m?

  12.13 Approximately how many electrons must be removed fr3y l0; 1ht .qmm2nlxdx lq95vfom an electrically neutral objenv2x05 ly; 1 hq3mldx.mqfl9 tct to give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal 6 k/mz0vc3(o,tmx my .)ztaxqwire 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)t az6 zxmxotq/vk,3c(my0 .m through a vertical cross-section of the wire during this time?

  13.07: Two identical7w h3txe 19zkc particles 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 k1 w7tcezxh93oices best represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced by a distance R, what is the ratio of twus;0ooy k5f:he gravitational s5ok:f oyu w;0force 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 luowfit*c+c*( q12at b;f: nsof charge Q and mass M being placed near a helium(f1uqa2ni *tc :t*o+fclb ws; 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 gravity.

  94.39: A small object with charge q and weight mgjmb-dncd yz1jrw .:87 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 fj:zbjw .r7dm 81 ndy-cield 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 conj-;)pfnedgx9m 9lp0 nnected to an insulating massless string in a vacuum on Earth. A uniform electric field exists throughout the region of the vacuum as indicated.mpnxfl;jp9 -nge0) 9d 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 wpg s;8el)l f 7oz6ykw2o:ld5yith equal speed v. Electron A is directed horizontallzg;5 8 kefl o)p:lo2ylysw76dy 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 a np9 abvz/y7ha/p te7q3egative point charge placed a distance 9 qapy/vt e3bzhpa 7/7x 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**qq ( cc,c5lpxylnm 2 separated by a distance R, the force between them is F. If the distance between them is quadrupled, the force be qn52llcqc*(y,mpx*ctween them is

  03.18: Two identical electrical point charges Q, separated by a distance produceckwvma) wnxhi/if; q *p,s 78; an electrical force ofF on one another. If the distance is decrea*7,pv8/ wnw;facm q)xhi; s iksed to a distance of 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway betwe7 i-m7eihg ;9jeg)8xxp+lpfien two point charges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of the fo7 ljigx;-ghe8i9 xpip7f)+me rce on the charge +q is:

  01.31: A positive point charge of +q and a nd jpdja/7pg,bdvbl*8k83w: vig t h 59 v7vyv9egative point charge of -q are separav tb9,8 /jg7lwh3 kvpdd g75v :dyvp9 8vjiab*ted by a distance d. What would be the magnitude of the electric field midway between the two charges?

  08.33: Two point charges are fixed on the x-axis inotherwise empty spyqx4b0bvy6p706qvjmf f1 ph1 ace as shownfvjm06 pqvbb x04y q1yp7fh61 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 otherwiswz+;jl xo1vr 7o*.9esaa 1 eq/ig nfi:e empty space as shown beliwa1:sfvo7zl.1xe + qe/or ng ;ai9 j*ow.
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 accompanyi72pllfosdo 2, /arruel53udxj+*5 s nng diagram. At which of the labeldn ud r+f5spljels5x3rl 2u 7*oao2/,ed points is the field most nearly zero?

  98.30: Four positivez hfmt7*l1u *k point charges are 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 of the total forcuth1*7k *fmz le on charge 3 is most nearly

  94.08: A point charge of +4.0 μC is placed on thq 3wl2 ed+9n w22mhhece negative x-axis 0.20 m to the left of the origin, as shown in the accompahqd2nc+l ww2m2ehe 93 nying 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 in/z 1tj*7shv bafinity. A point charge of +4.0μC is placed on the negatibjs7za/t v1h* ve 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 zero. What is q’s charge?

  03.27: Four electrical chak8gy7zmj 76 e 2yua e1pu7a)ggrges are arranged on the corners of a 10 cm square as shown. What would be the direction of the reyk) y1g7am u6e8 g2p7ezjga7usulting electric
field at the center point P?

  14.10: Two charges −Q and +Q,bmu qs.j91ehdm6(l 2e are fixed in place on the x-axis, 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 electric fielem6( d qhjs.921elbmud from the given charges?

  16.33 Given the configuration of three charges, +Q, +Q, and −2Q, which o1 0 jbds(54s x9bomgdrne of the following choices best represents the direction of the electric field at the point P and the sign of the electri brsdsjg1 49xdb 05mo(c potential at P from these charges?

  17.43: A semi-circle has radius R, total charge Q, and a charge per u)h z652t7 *zxr6qokw7 vtqtp rnit length given as tt6k7qxzhz*) prv5o7 w 6qrt2$λ=λ_0cosθ$ 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?