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Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: eelleektrostaatix!!!
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[Post New] 6 Jul 2007 17:08:10 IST
   Subject: Re:eelleektrostaatix!!!
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ashwani kumar (41)

Olaaa!! Perrrfect answer. 3  [16 rates]
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Answer d)..
Draw proper dia and resolve force F into two components Fsin@ will cancel each other and Fcos@ will add ............. where @ is angle which forces make with y-axis.
so net force toward the origin is 2Fcos@=-(2kqQ/x*x)*cos@.......... (where cos@=y/x)
so Net force the origin is = -2kqQy/x*x*x
here y ivary b/w -2a to 2a. 

so answer is (d)

but if y is very small as compare to a then it will execute SHM
  this reply:   2 points  (with 0  Olaaa!! Perrrfect answer.   in 1   votes   )     [?]
 
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