A 20-mc charge is 4 cm above an unknown charge q the
A 20-mC charge is 4 cm above an unknown charge q. The electric intensity at a point 1 cm above the 20-mC charge is 2.20x109 N/C and is directed upward. What are the magnitude and sign of the unknown charge?
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a 20-mc charge is 4 cm above an unknown charge q the electric intensity at a point 1 cm above the 20-mc charge is
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