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# A metal sphere of radius 15 cm has a net charge of $3.0 \times 10^{-8} C$. What is the electric field at the sphere’s surface?

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Given:

• Radius: $r = 15 \mathrm{~cm}$;
• Charge: $q = 3 \times 10^{-8} \mathrm{~C}$;
• Potential: $V(\infty) = 0$;
• Potential: $\Delta V = - 500 \mathrm{~V}$;

Required:

a) The electric field $E$;

b) The potential $V$;

c) The distance $d$;

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