In an electricity demonstration at the Deutsches Museum in Munich, Germany, a person sits inside a metal sphere of radius 0.90 mm. Charge is applied to the sphere until the magnitude of the electric field on the outside surface of the sphere is 3.0×105N/C3.0×105N/C. When the demonstration is over, the person climbs out unharmed. During the demonstration, what is the magnitude of the electric field inside the sphere?

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