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Standard XII
Physics
Capacitance and Capacitance
Question

Calculating Capacitance
An isolated, charged conducting sphere of radius $$12.0 \,cm$$ creates an electric field of $$4.90 \times 10^4 N/C$$ 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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