What is the magnitude of an electric field


a) What must the charge (sign and magnitude) of a particle of mass 1.42 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 670 N/C?

b) What is the magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight?

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Physics: What is the magnitude of an electric field
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