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P102 F09 Quiz2 Solution

# P102 F09 Quiz2 Solution - Name 5 ‘J “4“.“5(a How...

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Unformatted text preview: Name: 5 ‘J “4“.“5 (a) How much external work is necessary to assemble these three charges from inﬁnity, assuming they start and stop at rest? Please *1 “C give a numerical answer with units. (5 points) ’3‘ 2 m ”I \‘\ yt' 4' yf +we¥+ " ‘fg, + l’E; I,’ \“2 m 0 o O 31LC I”: ‘\ 41K" o------2 -------- 0 ~46 -‘ 1n = 33 ’6 "' ‘ " ’0 ) IO —‘ - - Went-F K( z)( + K(3Y )(qk/o >+J< (q”’°%(~lwro‘) ‘2 “II—hm Z. ‘ - i2. -!2. __2 -— E(-3+tz-4\wo -__—_ (‘lwro"), Sy(g ___ 218*“) T 2 -—-——I (b) How much external work is necessary to interchange the positions of the -1 nC and 3 MC charges? (3 points) (amt KE; :- b cur-«L he; so) _ PE.- WE; =5 {mew =0} roo'ufs. (6) Answer True or False. No need to justify your answer. (2 pen-its): Is the electric ﬁeld zero at some position inside the triangle? No. Is the electric potential zero at some position inside the triangle? ...
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