95.26: Two positive point charges r /9gnp.wayf8n z47d raepel 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 mang. wrd749f8 a/ ypzn?

  12.13 Approximately how many electrons must be removed from an elec gh uh)d;p7-zgtrically neutral)gu-z;hh gp7d object to give it a net charge of Q = + 1.00 C ?

  13.15 In a circuit, the6cb9bb 8a ez9s flow of electrons in a horizontal wire produces a constant current of 3.20 A for a time of 3.0 hour. Which one of the following choices bes9b6bb9ze c8 ast represents the number of electrons that pass through a vertical cross-section of the wire during this time?

  13.07: Two identical particles are k32ewu8mq+.0n9 c czktm xlj+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. Whic+80ck mwk.x mqc2+ n93jlue tzh one of the following choices best represents the magnitude of each particle’s charge?

  07.25: If two protons are spaced bjyf *mg87 )(bf 5gwiyqy a distance R, what is the ratio of the gravitayw q)g 5gffy8jib7 *(mtional 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 2y9ol tj;qvu6ig3r b1 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 ob9o l gyjbq 6ir31t2u;vject 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 attached to one end 15x lti -al f3bu ga5my me3wwcsw2.0wfuj4:6of 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 thia ffm3et03 6g 4w51c wu-y5wux2j m.wl:l bsae 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 conne14(uzf pdh jntd 39o7pi++rmbcted to an insulating massless j+pfnr7 3 iu1m( hp4d+dtzob9string 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 illustrated paths best indicates the trajectory of the mass?

  13.29 Two electrons enter a region between charged capacitorv ,du9 fr+t 3klm7s68ab aldz* plates with equal speed v. Electron A is d 73dv8al*f,r6u dm9ltk+ asz birected 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 po*qz c9ik,( xjlint charge exerts a force of magnitude F on a negative point charge placed a distance x away. If the distance between the two point charges is halved, whkxiqj( 9,z *clat 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 rz1svsmy;j z k*(f9: fseparated by a distance R, the force between them is F. I:z*ms 9z1kfs y(r f;vjf the distance between them is quadrupled, the force between them is

  03.18: Two identical electrical point charges Q, sl ,)c6lt1b looeparated by a distance produce an electrical force ofF on one another. )o,b1lcl6t 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 cxroxe 66o31rlq/ 46 5y qacxtpftw5(dharges +3q and -q separated by a distance 2d. If Coulomb’s constant is kcf3 dett 1 q(46arqlw5p ory65/xx6xo, the magnitude of the force on the charge +q is:

  01.31: A positive point charge of +q and a negative p t:wc cc*g4 :-wqph0taoint charge of -q are separated by a distanc a0cqwt:-twpc 4:h *cge 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 inotccg4545ilis :c*dvnh herwise empty space as shown b5icd *hcn4lg:v4sci5elow.
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 xh x8hz o 5v4ip)o;px/space as shown ov/; p)hxhxpi 458xzo 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 accompanying diagraixia-j)5m . ,w*f jnkwzzf 5h,m. At whicw5zj,hj,i k)zanf-m x5i fw *.h of the labeled points is the field most nearly zero?

  98.30: Four positive point charges are arranged as shown 9v ahw.oemzfoi09pifx* k)(l b;83hhin the accompanying diagram. The force between charges 1 and 3 is 6.0 N9z9fe. x)wihvhfm;bhp830o* lo( ka i; 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 i blfs yadk(+a r ffwf768u615ws 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 qyfsu 5 8bff(7+6dafk16arw w l 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 isc)ydhq0;k*spiw)v. i zero at infinity. A point charge of +4.0μC iwi)pc). vy0ik dhs;q* s 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 origin is also zero. What is q’s charge?

  03.27: Four electrical charges are arranged on the corneu o/;jc*buqq mnk,u ;11n;anf rs of a 10 cm square as shown. What would be the direction of the ru;qu,cqn/k1ufna1 * j;n; obmesulting electric
field at the center point P?

  14.10: Two charges −Q and +Q, are fixed in place on the x-arg6mnzg8,m6 lzz ;)ux xis, each a distance a frou gr6glz6; zx,mzmn 8)m the origin as shown. At the 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 three charges, +Q, +Q, and −2Q,mo 2dletx:wso861tq 6 which one of the following choices best represents the direction of the el6xe 2q6twtlsomd81: o ectric field at 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 unit2nhsw: evj 1lti 21pj+ length g1+i 2 jt2wvel1psn:jhiven 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?