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# HW1_Sol_1_F11.doc(1) - a 2'1 HOMEWGRK SET 1 r t s w Phys...

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Unformatted text preview: a 2'1 HOMEWGRK SET 1 \ ,:' r. t s w Phys 2114 instructor: Professor Bandy FALL 2911 @ Two small plastic spheres each have a mass of 2.0 g and a charge of —50.0 11C. They are placed 2.0 cm apart. a. What is the magnitude of the electric force between the spheres? b. By What factor is the electric force on a sphere larger than its weight? 2. In Fig. 1: three charged particles lie on an X-axis. Particles l and 2 are ﬁxed in place. Particle 3 is free to move, but the net electrostatic force on it from particles l and 2 happens to be 26111 ing} : L12; “filial: l5 fatlQ 0f ql/lqg? @ A —10 11C charge is located at the origin. a. What are the electric ﬁelds at the positions: (x,y) = (5,0), (~55), and (~5,—5) in cm? Write each electric field vector in component form. b. Draw a ﬁeld diagram showing the electric ﬁeld vectors at these points. 4= A glass rod that has been charged is +12 11C touches a metal sphere, Afterworda the rod’s charge is +8 nC. a. What kind of charged particle was transferred between the rod and the sphere, and in which direction? That is, did it move from the rod to the sphere or from the sphere to ﬁre rod? 1). How many charged particles were transferred? 5. What is the force F on the 2 14C charge? See Fig. 2: Give your answer as a magnitude and a direction. 6. The net force on the 1 rs? charge is zero, What is q? See Fig. 3 i 7. In a simple model of the hydrogen atom, the electron moves in a circular orbit of radius 0. 053 nm around a stationary proton. How many revolutions per second does the electron make? 9 Two 3.0 g spheres on J.0~m-long threads repel each other after being equally charged. What is the charge (1? See Fig. 4. 9. A charge of 6.0 is to be split into two parts that are then separated 3. 0 Calculate the maximum possible magnitude of the electrostatic force between those two parts. Calculate the number of coulombs of positive charge in 250 cm‘g of neutral water. L12 L23 1 ..... 2 S: ... _ _ 2 1 2 3 Figure 1 _______ ".11-"--- . +2 136’ ; g [In I 5 l n z \ n r. 2 Gin: 1 C : 111’"? II : \\ ii} I“ 1 "-72 r' ‘r 1 672 An- .+ n ' .1 ‘t u r 2 cm: ,‘200 i 200‘“ .3600 69?. 6 _______________ “6 x i x +4176 +4HC 36m 3cm +2 C .itlg .305! 1 cm +2 77C n (I q Hbmzwaﬁik SET / n ‘ - M \$5,! ‘3, m 3) Ci?- @ ,5, n0 —50na ow — v M We a \$9} F a ' L 2.03 2cm 205 I ‘ l 1’\ Wu "mgoeer 2 J 9' ‘2 (50XW'CIC‘) a. s 7’. we £5134 -‘- - N [Fl 0 ' £1; (o.a£m)" 0 0563 ’3- 7t" Hg/ 0.54am 0.513”! - W _-: WMWW r “ﬁx—WWW»), :. z ’ 8 WW“ m5 (’2 05% Hem/5;) ___. 1933 l\ ekfk’ ® I - -A g A q A E: «(‘91 J E: W W 7/“! Ed) IQ 7’ ‘ \ yv‘ E1 ‘ 7 ﬂ Ni,‘ MA7¥ ,,.,,,. ,7-" .,.,~.% H\$jwlona (D r, ‘ f g 0+ CD (5,03 {7 A VV L «m X10 6 A A ; a: ‘7 L W , Mva v L- ®;}/EJ E Elz<75xw €12 (manna) i .J ‘ 4 l E,=3.¢> X10” (to) N/¢ ~——~s—- ---- ~ “W” ~--~1 » 1 . w .. o a*@ (‘5.5) _, W13 V5W)14{S'w51‘ ‘=~ Som‘ 5%” if” 5 " L” "‘ «a a. “'96) ‘ -‘E2 .1 (7. a x 10 9 (MM: ..... “Ehfihjf 9 f... v-f a (W) ‘ 19V“! '9 A Is .4 '_ C A A ... 5", 4» 5d (W) = 9 N m?“ L: x ’0 > H as VF" ~'— E1 (7'Dx’0 (mgm V; W g 2 A E2: (ii-295(1qu ~L.2<. 85.10% ’3- . d— A ’\ /\ x A w i w 5 ,o ~‘~ 5 CHM} IX+® C 5';- > ) V‘g :3 50W?“ 'Va W m~W-~j.‘;::::2:'f":'t:g « V’S‘ombu E‘s :2 (1. 2g MUSE/1' Lu, ‘X.l04/3~§ a, £2,“ HoMEWoaK 551 I I,3,E;[email protected];, ta Sum 20 3 “ ev" X '4 M kin-{a = 6,342 n; \N’ % .\lm lm ~‘ ” W a. F<ﬁox_x ,E I Ra w: 1x r: mum M 363 ‘7" 5?- ,“ 5(th 2FT~O I 2524 7 52:0 ZFx : o TSVM?0“V\M7):O . r.) u I, . _‘ w 'lcos?o+Ff»0 ‘ “Val SVATG P : famh F l > T (0-003 (Ca/(331,3 '5’ o, 31 A) o, L :5 ‘ o 3 ( 3M2) (045%,) F 5 (3 ' ‘3 H N “f” “w (7‘ 0343 N ¢ F s K 3:. V3" ’ L '1 _ I [IN/ch) a at. g1 a; z W :3 (7/ IC 9“: xx 1073le m1 1? ’7'“ 7:44, X10”; a _ w 744, mg @ 3; -’ PAR/I 3 32 ” Pia/av" *1. ) 3, + 32 v é/ud .3: '13! Q1 IA.) a F v.1 (Wlﬂgwmgﬁg) : \nz \ F a. 1‘1 aw M Ax "mg E ; 3.5 3 0 or ELE 7-; g" a) ) \$3 a“?! if M 1’", 2 7-? 1/ Izt‘m' r ‘ a (9.0 C V‘ v ‘3, xao‘ﬁm 2 3‘ ’u .1 C)_ 1‘!“ 3‘6‘4/w‘c‘ F :3 ﬂ 3: ?I9 ‘ ' '\$ v a!" ‘L ’g» (3X!o.«3rﬂ§}‘£w Z , F: a“; . ’3! N 9% I: g} I C} I/ZJ ‘3’“ '5 X123 W \Iomwxi, :: 9.50 CLwa «hr» 250 g) ESla, dI—Wio\ 65f \éséf‘im. =' {New} ‘ 2 :(Awub 5 250 I ~_—, V455 ’ mun wwaf: H10 93 (Mel > «5/12 3/”?L M w. a!” rafﬂe” ﬁrm/{é we mpgwmg WA'rgzﬁ so AvaéA-nﬁ, W b ,cyxm: ; I 7 a 5! Q3: 0"! moiéS) (C, DQWDQJ V‘wﬁuquﬁwy‘k 19C ? 3 (mmSﬁC‘) =» I. 3 Ma Q r ‘w ' k. P———_———\ Wuﬁlaéugm E Q=WIJA a ‘7‘”? ...
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HW1_Sol_1_F11.doc(1) - a 2'1 HOMEWGRK SET 1 r t s w Phys...

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