(a) What must the charge (sign and magnitude) of  a 1.45-g particle be for it to remain stationary when placed in a  downward-directed electric field of magnitude 650 /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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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.