37. A charged dust particle of mass m = 32 mg and charge value q =100 nC is releasing from plate 1 with zero speed, where V₁ = 130 V, and V₂ = –30 V. The dust particle velocity when reaching plate 2 is,
(A) 0.03 m/s
(B) 0.05 m/s
(C) 0.75 m/s
(D) 1.00 m/s
(E) 1.25 m/s

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統計： A(17), B(1), C(2), D(40), E(1) #2356598

詳解 (共 2 筆)

面試倒楣鬼-22幸運上後西

B1 · 2021/01/19

#4501266

W = Fd = QV = 160*1...

(共 94 字，隱藏中）

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艾爾

B2 · 2021/05/24

#4744599

電力為保守力位能減少=動能增加

公式：qV=1/2mv^2

100 x 10^-9 x 160= 1/2 32x10^-6 v^2

V=1m/s

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