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Three charges are placed on the z-axis. There is a charge of +7.80 μC placed at z =-2.40 m; an unknown charge, Q, placed at z = +1.80 m; and a charge of +16.40 μC placed at +4.60 m. If the electric field at the point +1.00 m is to be exactly zero, what must be the sign and magnitude of the unknown charge, Q?please explain your thought process

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