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2midterm

# 2midterm - MIDTBRM EXAM PHYSICS1 12 October 7r 2 008 2...

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MIDTBRM EXAM PHYSICS 112 October 27 r 2008 YOURNAME REC. INSTRUCTOR INSTRUCTIONS: I page (both sides) of notes permitted There are 8 multiple choice questions, each worth 5 points. There are two "SHOW YOUR WORK" questions worth 30 points each. Total possible points for the exam are 100. Partial credit can be obtained in the "SHOW YOUR WORK" problems. Be careful to show each step clearly. There ure 5 totul puges, including this cover nuee PUT YOAR NAME ON EACH SHEET OF THE EXAM

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NAME l. Four identical conducting metal spheres have the following charges: S1=+2pC; S2:10pC; S3:4pC; 54: -4pC. They are brought together and make good electrical contact. They are then separated. What are the charges on each sphere after separation? a. The charges on the spheres do not change b. The charge disappears and the each sphere has no charge c. Each ofthe spheres have the largest charge, that of52,:1OpC @. Each of the spheres have 3 pC e. None of the above 2. At what separation will two charges, each other? a. 19.6 m @ o.+a m c. 40m d. 0.23 m e. 2.0 m rz l= +,,{o rt 3. The force that two like charges exert on each other is 20 N. What would be the force if the distancebetween the two charges were increased by a factor of 2 from its original value? @5N lF( -- ko' lf ' rt =-\4i @r\" gd*ALa +l1o4 .&*t w4udh g! si"tn[d^F =12,t exert a force of 1.4 N on lrl -^ KQ,9- ,,u, = fa"qqxto\(axP^o) (cxta-c) :"-:l;, ;: "[' ilff;'Y"'Tw. "( r @ uL 'wnap b. -3.33 x lo-roc 4 rf Q^ f f bt:i,5 , '"'I1 "t^v( z @(kA SuLrr/'(, l^ f a )qtf [email protected]')=FO 4. The difference in potential from a point charge between the radial distances I meter and 2 meters is 2 Volts, with the potential at 2 meters being greater than at I meter. What is the =f4.,lxtf'oc
NAME 5. In a parallel plate capacitor, the plates are separated by 3 meters and a voltage of 30 V is maintained across the plates. What is the value of the potential (relative to the negative plate) statements is necessarily true concerning theelectrica|potentia|energyofthepoiniB:3Vffii.i..i..'..-lBi.'.'..'; charge?

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2midterm - MIDTBRM EXAM PHYSICS1 12 October 7r 2 008 2...

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