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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Please solve this one
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[Post New]28 Apr 2008 17:00:10 IST
    Subject: Please solve this one
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rahulraj1 (14)

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Two pith balls,each having  weight of 10 mg are suspended from the same point by silk threads,each of length 0.25 m.When equal and similar charges are placed on them,they repel each other and are 10 m apart .Find the charges on each pith balls?
    
[Post New]28 Apr 2008 21:33:27 IST
    Subject: Re:Please solve this one
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payal_bon (27)

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[Post New]28 Apr 2008 21:40:08 IST
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payal_bon (27)

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[Post New]28 Apr 2008 21:45:09 IST
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payal_bon (27)

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Since the two pith balls have equal and similar charge they mak equal angles a with the vertical.

Let the midpoint of the distance of separation between them be O, the pt of suspension be P and one of the charge q be at point Q.

For equilibrium,

F=Tsina
mg=Tcosa

F/mg= tana.......1

tana = OQ/OP

Put this value in 1 and get F

Now put the value of F in coulomb's equation and get q.
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