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Three point charges are arranged along X...

Three point charges are arranged along X-axis. Charge ` q_1 =+3 muC ` is at origin, charge ` q_2 =- 5 muC ` is at x = 0.2 m and charge `q_3 =- 8 muC ` . Then, where is `q _3 ` located, if the net force on `q _1 ` is 7 N in the negative x-direction?

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The correct Answer is:
` x =-0.144 m `
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