A sphere of radius has positive charge uniformly distributed on its surface

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Electric Charges Fields and Gauss's Law · Electric Charges Fields and Gauss's Law

Problem

A sphere of radius rr has positive charge QQ uniformly distributed on its surface. Which of the following represents the magnitude of the electric field EE and potential VV at a distance RR from the centre when R>rR>r? (A) E=kQR2, V=kQRE=\frac{kQ}{R^2},\ V=\frac{kQ}{R} (B) E=kQR, V=kQrE=\frac{kQ}{R},\ V=\frac{kQ}{r} (C) E=kQr2, V=kQrE=\frac{kQ}{r^2},\ V=\frac{kQ}{r} (D) E=kQr2, V=kQr2E=\frac{kQ}{r^2},\ V=\frac{kQ}{r^2}

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