95.26: Two positive point charges repel each other with force 0.36 Nz,y 2z g2r+qhsz b0f6aj7gfu , when their separation is 1.5 m. What force do they exert on each ot+0zsz, b zru2 g hjaq6f7yf2,gher when their separation is 1.0 m?

  12.13 Approximately how many electrons must be removed from an electricah 23xo5kt 8m4- ymr-:qzr o .tfixax(blly neutral object to give it a neooz2ykr 3t.atm i58 xmf(h:-r4qx b x-t charge of Q = + 1.00 C ?

  13.15 In a circuit, the flow of electrons in a horizonta(h*jmq4 yj+y8bq s i2xl wire produces a constant current of 3.20 A for a time of 3.0 hour. Which 4qxb* 8+(y2j shimqjyone 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 distance ais24jl /1xtdof 0.50mapart. The electric forcjtxd2li14 s/a e that one particle exerts on the other 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 a distance R, what is the 3lf uuql(2 gglzcm ,:r:(i;ggratio of the gravitational fg2 :qizm3l:ucug(,lrg;l( g f orce 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 przvwgrqb:h d4 hg/;r:3oton of charge Q and mass M being placed near a heliumzr 4 h:v/wdgqh3;brg: 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 mg is athbn fs 57dpn/8tached 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 fbfdp 75hsnn8 /ield 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 )lv;;eo-hc+o oi j6yk ur9m7qof mass 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 th9ur kyie7l vo-;;+ cjomh q6)oe string is cut, which of the illustrated paths best indicates the trajectory of the mass?

  13.29 Two electrons enter a region between-b 5rdd84ag1 o*b6mwhtn- p d3k azphvyzl/54 charged capacitor plates with equal speed v. Electron A8db-5hmz k t-/a*d w yl64a4 zpb 3p1ng5hrdvo 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 magnif; (tv 4.hweve+za2.t66 ex ,cgxs mqttude F on a negative point charge plac64tmvs a e+c z..xv;h, gte6et2w(xqf ed 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 charged point-like objects are separated by a distance R, the ogbn; ez 3avj.l6i4)xforce between them is F. If the distance between them is que .6nix g;zolb3v4 j)aadrupled, the force between them is

  03.18: Two identical electrical point charges Q, separatefaqc683r8ps d d by a distance produce an electrical force ofF on one another. If the distance is decreased to868pq3sfa r cd a distance of 0.40, what is the strength of
the resulting force?

  96.34: A point charge +q is placed midway z8/ nrp7.xxwcyem2ndak::2r between two point charges +3q and -q separated by a distance 2d. If Coulomb’s constant is k, the magnitude of the force on the charge +q is:c/r 2np8xey.rzdw k7:a 2m:nx

  01.31: A positive point charge of +q and a negative point charge of -q are lh )r 852k3)8bmzeekcvgghe5 separated by a distance d. What would be the magnitk8eev)rhg zbc5h2ml)ge85 3 k ude of the electric field midway between the two charges?

  08.33: Two point charz7ax p62: xhqrges are fixed on the x-axis inotherwise empty space as shown belo6pra hx7qxz:2 w.
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 otherwise empty t6u c-butczv z4d4pc.z1 w )-gspace as shown b1c 4-gbu tup4wv.-zcz dz)c t6elow.
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 –ot6-k4nx hpe9 0lfs :k4Q are arranged as shown in the accompanying diagram.okx tpn:hk -9f6el4s0 At which of the labeled points is the field most nearly zero?

  98.30: Four positive point i16or4xdsx)p2g m kt 2ni/t i4charges 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 /rx1k46 gp2id oxm 2)n4ttsiitotal force on charge 3 is most nearly

  94.08: A point charge of +4.0 μC is placed on v4xnb)tddw6 ;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 origi txb)w;6dd4v nn is zero. What is q?

  95.36: Assume the electric potential is zero at infinity. A point chuzx-uw6cz*f9 arge of +4.0μC is pl9wx-6uf c*zuzaced 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 origin is also zero. What is q’s charge?

  03.27: Four electrical charges 4v dsi/ 07 ek.ez w)aae:ef1s.z moe1aare arranged on the corners of a 10 cm square as shown. What would be the direction of the ra i :1 asa/eeezdm7w1ez0s.4 o)f ev.kesulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-axis, eac5o6wqfb- qiyz/8fj.( x.ds xsh a distance a from the origin as shown. At th..s6x bfw/8q5yfso iqxz(-j de 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 configuration of 3y j 9tlwjtr/0 8,daekthree charges, +Q, +Q, and −2Q, which one of the following choices best represents the direction of the electric field at the point P and the sign of the electraejd t9y r/l0 tjk83,wic potential at P from these charges?

  17.43: A semi-circle has rad*qep2kz3 . ge txuem7d)b: t:uius R, total charge Q, and a charge per unit length. 32gbkztdpteue): *eq:x m7u given 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?