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exam1_2006

# exam1_2006 - 4 P hysics Exam I March1,2006 m Calculators ay...

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Physics 4 March1,2006 Exam I Calculators may be used, but no books or otherwritten materials. Answer all four questions and show the steps leading to your answers. Credit will be given based on evidence of your understanding of the material. Be sure to express all quantities in proper units. Possiblyuseful information F l q F . = - - 4ncn 12 Gauss'Law: qE d2-Q,,, leo F = q E r / l q t / - - - 4nto r surface area of a sphere : 4nrt ; r - m a I I = 9.0x 10n lv .mt I C' 4neo e :I.6 x 1 0-t' C Cuq,pnrnttnt - Ct + C' * "' 1 1 1 Cuq,r"ri^ Cl C2 Ruq,rrriu, -4 +Rt *"' 1 1 1 _ - + - + . . . Req,parattet R1 R, V = I R i -ioe-''^c, charging a capacitor Q : C V U:!cv2 2 P = I V b ' 4 r l r l I n I vo-vu- JE.dl

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1. Five conceptual questions. Answer briefly (a sentence or two!). (2 pts. each) (a) Two alumtnrzed spheres of equalradii hang by insulating threads. Using a glass rod and a piece of silk, how do you insure the two spheres receive exactly the same charge? (b) How doesthe spacing between equipotential surfaces reflect the strength of the electric field?
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