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PHYS 2114 Exam 1 Spring 2008

PHYS 2114 Exam 1 Spring 2008 - Physics 211 1Dr.Bandy Page 3...

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- Physics 211 1Dr.Bandy Page 3 Signatur2 (50 points) 123 iSD 11 . ....... : __ L_- ...•.. U~ ..;l..~••:•.• - .J•• .•. 1- __ 1__"""':_ -'i ...•. I..d..o. •.. r. - ~ ';I ..,. Problem 1 (See Figs. la and Ib) (50 points) (a) Sketch and label on Fig. la each electric force acting on the electron at position A. (b) Sketch and label on Fig. lb each'~k1 at position 1>. (e) Calculate the electric force of charge 2 acting on the electron located at position A (d) Calculate the electric field £2 at point 1>. (e) Calculate the electric potential at point 1>. (f) Calculate the potential energy of a proton located at point 1>. +iO V'vGcp-_LCPl 0-5 V'vG +iO V'vG 0-!-"-"!.---0 -5 V'vG . . . . 4cm: ,,? 4cm: -- ! Fz~~ ! +~!b /1 riI A ..... / : 11>.- +5 V'vG v--;;o. A +5 V'vG 0---------. ~t.t E \ Fignre la Figure lb 7 'J (. __ ;r-- '- -r3 x\O 5. 0 7... )( ...-:..:-_--J - 4-e ~e.-. l __ \@.'7 \ /0 q '- i 1 t .••.. L - r'1'l. J: l,i .~. \' 0'1 d-':y I':)
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~ysics 2114 Spring 2008 Midterm Exam 1 Dr. Bandy Page 3 Problem 2 (50 points) A spherically symmetric charge distribution produces the electric field E = 5x 10 3 r 2 F N/C, where r is in m. /'--- - --G (a) Sketch the graph E vs r. __) (b) Calculate the electric field strength at r = 20 em.
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