Written Homework 12 Solutions

# Written Homework 12 Solutions - Physics Fall2007 221...

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Physics 221 Fall2007 Written Homework due Tuesday November 13 1-- It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically downward. At an altitude of 300 n4 the field has a magnitudeof60.0N/C. Atanaltitude of20O nr,themagnitudeofthefieldis l00N/C. What is the amount of charge contained in a cube that is 100 m on edge that spans this vertical 100 m of air, i.e that has horizontal faces at altitudes of 300 and20O m? fe.6eo r\${( qu= \$; ,, T = I e= \oo Nlc -r^ E {/ fi* = (1o1 (*.*f( ,*Nlc-60 ufd X * X{o r.r(') +E*._=Ar€. (r,t;) [{n pt.J [(,t:r \o- t ii'\ {.*,C =- t,stl \ [o c C K NqTE'. ltren€ \q oNL\ trLu\ {l\Lav G\\ ToP f\.Jfl hu[[o4" A.oLra"axrT\\- \l\$q-s ()tr "T-r\$;' t-un\c trru<€ n tl VqLT \Cr\L- "

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Physics 221 Fall2007 Written Homework due Tuesday November 13 2-- In the figure drawn below, a small, non-conducting ball of mass m : 1.00 mg and charge q- 2 x l0-8 C (distributed uniformly through its volume) hangs from an insulating thread (massless) that makes an angle 0 : 30.0 o with the vertical, uniformly charged, non-conducting sheet (shown in cross section). Assuming that the sheet extends for a
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Written Homework 12 Solutions - Physics Fall2007 221...

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