Electric Forces and Electric Fields2515.50Consider the free-body diagram shown at the right. 0 cosor cosymgFTmgTθΣ=⇒==sintanxeFFTmgΣ=⇒ ==eFqE=tanqEmgSince , we have =, or tanmgqE=()( )3232.0010kg9.80 m stan1.0010 N Cq615.05.2510C5.25 Cµ−×−×°==×=±±²±±²²±³³15.51(a) At a point on the x-axis, the contributions by the two charges to the resultant field have equal magnitudes given by122ekqEEr. The components of the resultant field are 22sinsin0eeyyyEE Errθθ=−=−=
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