95.26: Two positive po02he7 mgla6j9 :jjso gint charges repel each other with force 0.36 N when their separation is 1.5 m. What force do they exert on each other when their separation is 1.0 m7 :eljhja6o92gjms0g?

  12.13 Approximately how many electrons must be removed from an electricallydynmh da* fq3k78w v2xg r)u;; neutral object to give it a net chaa) ;2hquf*r g8dx 7y3dvkwmn;rge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizontal wire produce8i*w ghdef o0w0xn0o(ax-v, rs 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 passw(noho -vge adxr, x80wi00*f through a vertical cross-section of the wire during this time?

  13.07: Two identical particles a8 u e8p+p*kbx+ju8 bware fixed in place a distance of 0.50mapart. The electric force that one particle exerts on the oth8+kwu8 8upbx +apj* eber has a magnitude of 3.00 N. Which one of the following choices best represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced by fex8*vmbkr x/7rn 53 ia distance R, what is the ratio of the gravitation/k58ifxevrnrb 3*x7 mal 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 with a proton of cha-cmgoor( nwp re -q377rge 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, wh--mog7prw3(rq 7e nocich 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 mg is attzem *0x5)jweyached 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 jez0w5*x em)yfield 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 ofv29,uz co,w popv/u6xi/nq k. mass M and charge Q is connected to an insulating massless string in a vacuum on Earth. A uniform electric field exists w xo/q,kzi6 uo.puc n,pv9v2/ 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 actsiehz liv4(g 10fmsm 9d*54 region between charged capacitor plates with equal speed v. Electrs fzl01 tmvc( s549h*md4ieigon 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 negat7n; 1*qit qprfive point charge placei7tr q;*pqnf1d a distance 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 chargedkt5 ) ,txlq*du point-like objects are separated by a distance R, the forcdlq5x,u *) ktte between them is F. If the distance between them is quadrupled, the force between them is

  03.18: Two identical el 3zp1i.lhecl+ ectrical point charges Q, separated by a distance produce an electrical force ofF on one another. If the distance is decreased to a distance of3ec1.l+ zhpl i 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway betwcb x87 l:yv 84y:.incfaw0 grieen two point charges +3q and -q separated by a distance 2d.8wvribcxi f:8lca7yn4. gy : 0 If Coulomb’s constant is k, the magnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a negative point charge of -q are sepayrl:(o:6ie a co6.uul rated by a distance d. What would be the magnitude of the electric fieldre u6layo6(.o ci:: lu midway between the two charges?

  08.33: Two point charges are fixed on the x-ahfn/8 .*5h c 4wh ykkp; tp.nheco7h.cxis inotherwise empty space as shown below.y/hhh c.kkcc;fpw84nt* hhon 5.pe.7
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-ao9o1/ cr ,ex/mq6 mcboxis in otherwise empty space as shown 96o1 c,ob emocmr/x/q 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 sh*60pqd xtcs: jown in the accompanying diagram. At which of the labeled points:t0jd x*spc6q is the field most nearly zero?

  98.30: Four positive point charges are arranged a)mr ;in1xb9qy s 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 3.0n1i bqm yrx9); 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 xlx/ yjq-m hd8:-axis 0.20 m to the left of the origin, -jhdl :xm8/qy 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 at infinity. A point charge of uqk+ 1cs+ ;h-wyst 0qq+4.0μC is placed on the negative x-s+0suq qc kt qy;1wh-+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 ch m/y v0 4qlgxwo7*ia7parges are arranged on the corners of a 10 cm square as shown. What would be the direct xmy7g/qa7wpv0 ol* 4iion of the resulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in k yga7t92lmxl)a u+:fplace on the x-axis, each a distance a from the origin as shown. At thet7:)u l gf+axm92aykl point labeled P, a distance along they-axis from the origin, what is the direction of the electric field from the given charges?

  16.33 Given the configur83mc8kjsl mx2 ation of three charges, +Q, +Q, and −2Q, which one of the following choices best represents the direction of the electric field a2kcsxj 8m83l mt 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 le 5fukx43sl 37;zt yetr5a6rchngth given askt;r4556hcr 7 3a zlxtsf 3uye $λ=λ_0cosθ$ 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?