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![[Post New]](/templates/default/images/icon_minipost_new.gif) 28 Apr 2008 11:03:52 IST
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A charge q is placed at the center of the line joining two equal charges Q.What will be the value of q such that the syatem if the three charges are at equilibrium?If e=electronic charge,what is the minimum magnitude of Q?
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28 Apr 2008 11:43:16 IST
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ans is Q/4
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28 Apr 2008 11:45:04 IST
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SORRY -Q/4
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28 Apr 2008 11:48:04 IST
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system will be in equillibrium if force between Q and q +force b/w Q and Q =0
so kQq/(r/2)^2 +kQQ/r^2 =0
so u will get q = -Q/4
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28 Apr 2008 12:43:33 IST
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But u have written r2.
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28 Apr 2008 12:50:10 IST
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take k/r^2common and u will get
k/r^2[4Qq+Q^2] =0
so Q^2=-4Qq
and q = -Q/4
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