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Unformatted text preview: 1) Four electric charges are distributed as shown. 81 and 82 are surfaces enclosing
two different volumes. 81 lies inside 82. The total electric flux out of the volume enclosed by surface 82 is zero. W hat is the charge q? b) O. 0) ~4Q d) Requires knowledge of the flux passing out of surface 81. 2) A cubic box of side L contains a point charge Q and sits in a non uniform electric
ﬁeld. If the outward ﬂux arising from the combined field of the point charge and the non uniform field is GD for one of the sides, the total outward flux of the
combined ﬁeld through the other 5 sides is a) ~5® +Q/80
Kc) -<l> +Q/eo d) +5<i> - Q/So 3) A nonconducting sphere of charge q = 1.50 X 10'9 C is at the center of a hollow
spherical conducting shell of inner radius r1 = 5 m and outer radius r; = 6 m. Let
the total charge on the inner wall of of the shell be Qin and the total charge on the outer wall be Qout = 4.50 x 10'9 C Assume so = 8.85 x 10'12 or k = “(477580): 9.00
x 109 in SI units. a) Find Qin .
b) What is the total electric ﬂux passing out a sphere of radius R = 10 m? c) Find the magnitude ﬁeld at radius R and draw arrows indicating its
direction at a few points. d) If q is now placed oﬂ center, is charge density Qm distributed evenly on
the inner surface of the conducting shell? Justify your answer brieﬂy in words. a} ﬁE‘IJ fie? faeJLaajiWr‘ =30 m. 09 ﬁ/ﬁex ﬂwae‘gg
5% W M at rm swam ==> all, e a: SM/Gfrzsgg’ b) R) 5’2 3 jib/9%? f/MX EJWC- % Wr/WJ‘GJ réeﬂf
é a. ‘9' grin “‘ﬁ' @626”? “t water“ @ :1" %°f?’a”§
& 17- Qwr/ga E} watfwze g: all} Get wave/t?» dera’rwéﬂea re ﬂeet‘e‘i j??? ﬂea set
2 ° Jim We}? twee feedeseﬁew‘, ‘53 ...
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This note was uploaded on 05/13/2010 for the course PHYSICS 54L taught by Professor Thomas during the Spring '09 term at Duke.
- Spring '09