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Two charges are located on the axis shown below. A charge $+3q$ is located at $2R$ from the origin while a charge $–q$ is located at $–R$ from the origin.
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Where could a charge of $+7q$ be located in order for the electric field at the origin to equal zero?
Between $-4R$ and $-5R$
Between $-5R$ and $-6R$