InterviewSolution
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InterviewSolution
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Two chargesQ and -3Q are placed fixed on x-axis separated by a distance 'd' Where should a third charge 2Q be placed such that it will not experience any force? |
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Answer» SOLUTION :Let CHARGES Q and -3Q be placed at POINT A and Bseparated by a distance d. The third charge 2Q should be placed at point p on extension of LINE BA never the smaller charge of Q at distance x from it. As net FORCE on 2Q charge is zero. ` therefore "" oversetto (F_(F)) =oversetto (F_(A)) +oversetto (F_(B)) =0 or oversetto (F_(A)) = oversetto (F_(B)) ` ` rArr ""(1)/(4 pi in _0) .(Q(2Q))/(x^(2)) =(1)/(4 piin _0)((-3Q)(2Q))/((x+d) ^(2))` ` rArr ""(1)/(x^(2)) =(3)/((x+d)^(2)) rArr x=(d)/((sqrt(3-1)) ) ` 
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