Three point charges all positive. If the net electric force on the central charge is zero, what is

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Tje figure below shows three point charges all positive. If the net electric force on the central charge is zero, what is the value of y/x?
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A string is stretched by two equal and opposite forces of 10N each.Tension in the string is ...
kindly explain.boht see books main different ans hy .

latifsway