Question: Positive Test Charge is located at the center between two charges. Both charges have the same magnitude but opposite sign and separated by a distance

Positive Test Charge is located at the center between two charges. Both charges have the same magnitude but opposite sign and separated by a distance of a. The magnitude of the electric field at point A is 30 N/C. If the test charge moved 1/2r close to one of both charges, what is the magnitude of the electric field at point A?

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