Problem 31
(II) A long uniformly charged thread (linear charge densityA = 2.5 C/m) lies along the x axis in Fig. 21-56. Asmall charged sphere (Q = -2.0 C) is at the pointx = 0 cm, y = -5.0 cm. Whatis the electric field at the{joint x = 7.0 cm, y = 7.0 cm?Fthread and Eq representfields due to the longthread and the chargeQ, respectively.
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• System o Objectsinit o Forcesonitfromoutside(external) Fd Forceand Ability“todo Positivework Displacementare stuff”increases done parallel Fd Forceand Ability“todo Negativework Displacementare stuff”decreases done anti-parallel F Forceand Ability“todo Zeroworkdone Displacementare stuff”is d perpendicular uncharged W=±Fd Joules=Newtonsmeters (J)=(N)(m) Work=Forcedisplacement • ASystemHas: o Theobjectbeingdisplaced. o
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Chapter 21, Problem 31 is Solved
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