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September 25, 2006 Physics 117 ExamI ~ SO Won Your name: ' OU —_ PID No.--------------- This is a closed book exam. ‘Qye page (one sided) of your personal notes is allowed. All your work should be shown on these sheets. If you need more space, work on the back of the page and indicate where the extra work can be found. At the end of the exam, you are expected to sign the Honor Pledge that you have neither given nor received any aid on this exam. i Honor Pledge Signature: E=1.60x 10°C; m= 9.11x 10°! kg; 1 eV = 1.60x10"” Joules; e9 = 8.85x10? C2/N-m2 Q.1 The capacitances C, = 1.0 uF and C2 =3 uF in the circuit at the right are both charged to a potential difference of 100 V but with opposite polarity as shown. Switches S, and S2 are then closed. (a) What me is the potential difference V.-V» between the points a and b? [x3 f ninety 4 Bye Os A= 16100 =1on}Ced ra i nus Ze Ib x Lop He cass UnBew pose? final c! ange on Paheeteel 3 BBs __T* \V 22 Qy rh, Oy 2 e b ©) Gi if the = SOC oe C2? “ar abt mone iS cde : Qe =}99 KC eo ee cat Q.2 Asmall plastic ball with mass m = 2,00 g is le bya $iinn age 1 a= Ste SoG aX om in a uniform horizontal electric field E = 1.0x10° NIG as shown. If the ball is 3 (4/- in equilibrium when the string makes an angle of @= 15° with the vertical, what is the net charge q on the ball? ee- be A E Ke Fe= qE 7 ag, gin LEGO Td WA MY gs Nad Ean® = 2x10« 4.9.x fants?) oxlo?N As £-25 X06 p= sis bE 
