31. A metal sphere carries a charge of 5 × 10-9 C and is at a potential of 400 V. The potential at the center of the sphere is:
(A) 400 V
(B) – 400 V
(C) 2 × 10-6 V
(D) zero

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統計： A(1), B(0), C(1), D(4), E(0) #874934

詳解 (共 1 筆)

#2144705
Sphere=球體Spherical s...
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