Unformatted text preview: yields qE − T sin θ = 0 and the sum of the vertical components yields T cos θ − mg = 0. The expression T = qE/ sin θ , from the Frst equation, is substituted into the second to obtain qE = mg tan θ . The electric Feld produced by a large uniform plane of charge is given by E = σ/ 2 ε , where σ is the surface charge density. Thus, qσ 2 ε = mg tan θ and σ = 2 ε mg tan θ q = 2(8 . 85 × 10 − 12 C 2 / N · m 2 )(1 . × 10 − 6 kg)(9 . 8 m / s 2 ) tan 30 ◦ 2 . × 10 − 8 C = 5 . × 10 − 9 C / m 2 ....
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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.
 Fall '08
 SPRUNGER
 Physics, Charge, Force, Mass

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