Question: An isolated charged conducting sphere of radius 12.0 cm creates an electric field of 4.90 x 104 N/C at a distance 21.0 cm from its

An isolated charged conducting sphere of radius 12.0 cm creates an electric field of 4.90 x 104 N/C at a distance 21.0 cm from its center.
(a) What is its surface charge density?
(b) What is its capacitance?

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