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A particle of charge 2.0×10−8C2.0×10−8C experiences an upward force of magnitude 4.0×10−6N4.0×10−6N when it is placed in a particular point in an electric field. (a) What is the electric field at that point? (b) If a charge q=−1.0×10−8Cq=−1.0×10−8C is placed there, what is the force on it?

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