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An isolated charge 'Q' of mass 'm' is suspended freely by a thread of length 'l'. Another charge q is brought near it which is at distance ' r'( r>>l). When Q is in equilibrium, tension in thread will be

Answer» An isolated charge 'Q' of mass 'm' is suspended freely by a thread of length 'l'. Another charge q is brought near it which is at distance ' r'( r>>l). When Q is in equilibrium, tension in thread will be


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