A negative charge of  -0.55 ×10-6 C exerts an upward force of 3.4 N on an unknown charge that is located 0.30 m directly below it. k = 9.0 x 109 N.m2/C2 a) What is the magnitude and sign (positive or negative) of the unknown charge? b) What is the magnitude and direction of the net force on this unknown charge, if it has a mass of 0.42 kg? c) If the unknown charge were free to move, what is the magnitude of its acceleration?

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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.