21. An electric field of approximately 100 V/m is often observed near the surface of the Earth. If this were the field over the entire surface, what would be the electric potential of a point on the surface of Earth? (set V=0 at infinity)
(A)0
(B)1.6×10⁸ V
(C)3.2×10⁸ V
(D)6.4×10⁸ V
(E)1.28×10⁹ V

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