Two point charges of charge values Q and q are placed at distance x and x/2 respectively from a third charge of charge value 4q, all charges being in the same straight line. Calculate the magnitude and nature of charge Q such that the net force experienced by the charge q is zero. [Ans Q = q/4 , +ive ]
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you can use the formula
1/4πE•q1×q2/r^2
1/4πE•q1×q2/r^2
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