25_Ch 15 College Physics ProblemCH15 Electric Forces and Electric Fields

25_Ch 15 College Physics ProblemCH15 Electric Forces and Electric Fields

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Electric Forces and Electric Fields 25 15.50 Consider the free-body diagram shown at the right. 0 cos or cos y mg FTm g T θ Σ=⇒ = = sin tan xe FF Tm g Σ=⇒ = = e Fq E = tan qE mg Since , we have = , or tan mg q E = ( ) ( ) 32 3 2.00 10 kg 9.80 m s tan 1.00 10 N C q 6 15.0 5.25 10 C 5.25 C µ × ×° == × = ± ± ² ± ±² ² ± ³ ³ 15.51 (a) At a point on the x -axis, the contributions by the two charges to the resultant field have equal magnitudes given by 12 2 e kq EE r . The components of the resultant field are 22 sin sin 0 ee yyy EE E rr θθ  = =−=
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