95.26: Two positive point charges repel each othvs/4q j(k+byw er with force 0.36 N when their separation is 1.5 m. What force do they qk w(b4 vy+j/sexert on each other when their separation is 1.0 m?

  12.13 Approximately how many electrons must be removed frcvmwin :q;4g 9om an electrically neutral object to givev :imw 94n;qcg it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal wirik wf 4q45tw0ee 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 of the wire durink qwte04wf5i4 g this time?

  13.07: Two identical particles are fixed i, :jum2igkc ;ls. n1 +8oypwbhn 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 choices bestuysbjcp +;nm:k w2.ohlg8 ,i1 represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced by a distance R, what is the ratio of the gb*bu)y,ck4u5s h m 9pjz.+urxravitationalruzbmhpckx4.b *)9jus+ u 5,y 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 wnb.ck+q mt r.sdee4.6 ith 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 electric force from the other and which object experiences the greatest magnitude of acceleration? Ignore gravin.kdrbe ..e6+ms4t c qty.

  94.39: A small object witwl 1cjg;)3x f-plun +d.kc0 -t6ytpgj h charge q and 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 accompanying figure. In the presence of the field, the string makes a constant angle q with the vertical. What is the sign and magnitude 10;p t+l-x-unwjcjk lg3f)pg .dytc6of q?

  09.38: A small object of mass M and x x xugbc(+2y9u(czn/5 e-moycharge Q is connected to an insulating massless string in a vacuum on Earth. A uniform electric field exist xboycu/y (e+c(- 9nx5mux2z gs 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 j n7akqgp3r9 )gak 93ja region between charged capacitor plates with equal speekg39a3q)n7r9jgpjka d v. Electron 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 force of magnitude F on a negative point xus ft;/x03ojb2 kkty 3pt.7f charge placed a distance x away. If the distance between the two point charges is halved, whatftu otjx7 33.by/2fxk0kt; p s 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 b28 74y ufloifey a distance R, the force between them is F. If the distfef 84ouil2y7 ance between them is quadrupled, the force between them is

  03.18: Two identical electrical point charges Q, oxfz6 ab6 lg o-77*pinseparated by a distance produce an electrical force ofF on one another. o6b- f n7zxp67agi *lo 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 +3+l0/foi s-dn:tvhgz +wohm97q and -q separated by a distance 2d. If Coulomb’s constant is k, the ldov+ 9hfm:ig+7znhtw0/o - smagnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a negative point charge o0y3eq+p xek0+hb/ m hcf -q are separated by a distance d. What would be the magnitude of the electric field midway between the two charges? pb0qhm y+x/he3+ c0ek

  08.33: Two point charges are fixed on the x-axi854ywp a m4ca7x uq 9bnne,n*vs inotherwise empty space as shown b q7e8n4nx cn4amuyw9v,b5 a*p elow.
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-axisssdljiy8 1k :; in otherwise empty space as shown below. 1ldy; ikssj: 8
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 accom:p1-sn 8/eu aetsj*e upanying diagram. At which of thes:8 e-jseupu 1*/eant labeled points is the field most nearly zero?

  98.30: Four positive point chkrx0f+3i j6wo8l q; vqarges are arranged as shown in the accompanying diag oqk0x36l+ ;jr fiqvw8ram. 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 thewmxw:axp (*/ ep0o7z*a j2bxq 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 at2be/w* p7xo0p*a jmzax: q(wx the origin is zero. What is q?

  95.36: Assume the electric potential is zero at infinity. A point d . 5beo/,6aarr5 rbydcharge 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 o,65b5/rba odr.d yearrigin is also zero. What is q’s charge?

  03.27: Four electrical charges are arranged on vxorvz, /+c emnile9hy tz5a27u3m.4 the corners of a 10 cm square as shown. What would be the direction of the resulting.lm+t xv,mh c3zrzn/4i e725uo9yv ae electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis, each a dist-filvi -2pq* uance a from the origin as shown. At the point labeled P, a distance alop- fl*vii-2uqng they-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 − kdh ,)30glt2sl3qn mi2Q, which one of the following choices best represents the direction of the electric field at the point P and the sign of the electric potential 2m0 3iksd hntl), g3qlat P from these charges?

  17.43: A semi-circle has radi(rb r3i 3a;ddpus R, total charge Q, and a charge per unit length given a pb;ari3 3d(rds $λ=λ_0cosθ$ 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?