30CHAPTER 15 15.58As shown in the sketch, the electric field at any point on the x-axis consists of two parts, one due to each of the charges in the dipole. 22eekqkqEEErr+−+−=−=−()()()()() ()()222222224eeeekqkqxaxaaxEkqk qxaxaxaxaxa2+−−=−==−+−+−22xa>>Thus, if , this gives 4344eek qaaxEk qxx≈=15.59 (a) Consider the free-body diagram for the ball given in the sketch. 0 sin37.0or sin37.0xxxqEFTqETΣ=⇒° ==°0 cos37.0or yyFqETmgqEqEΣ=⇒+° =+and Thus, cot37.0yxmg° =()()()32581.0010kg9.80 m scot37.05.003.00 cot37.010 N C1.0910C10.9 nCyxmgqEE−−×==+°
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