P23_034

# P23_034 - 4 3 r 3 = m sphere Since the mass of the sphere...

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34. (a) Since ~ E points down and we need an upward electric force (to cancel the downward pull of gravity), then we require the charge of the sphere to be negative. The magnitude of the charge is found by working with the absolute value of Eq. 23-28: | q | = F E = mg E = 4 . 4N 150 N / C =0 . 029 C . (b) The feasibility of this experiment may be studied by using Eq. 23-3 (using k for 1 / 4 πε 0 ). E = k | q | r 2 where ρ sulfur
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Unformatted text preview: 4 3 r 3 = m sphere Since the mass of the sphere is 4 . 4 / 9 . 8 . 45 kg and the density of sulfur is about 2 . 1 10 3 kg/m 3 (see Appendix F), then we obtain r = 3 m sphere 4 sulfur 1 / 3 = 0 . 037 m = E = k | q | r 2 2 10 11 N / C which is much too large a eld to maintain in air (see problem #32)....
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## This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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