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  4. Two charges -Q and -9Q are placed at a separation of 3m. Where should charge q be placed so that net force on it is zero ? <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-lai8890nwnnujzqc.jpg />

Q. Two charges and are placed at a separation of Where should charge q be placed so that net force on it is zero ?

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