What is the intensity of el. Fields vr 30 Cm and Q 3x10na -6 C. How much force will act on the particle carrying the elementary charge?

The whole question did not fit into my assignment .. I would be grateful if you could help me. What is the intensity of the electric field at a distance of 30 Cm and a point of charge 3x10na -6 C. How much force will act on the particle carrying the elementary charge?   
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