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Câu 5. Một electron bay trong điện trường. Khi qua điểm M có điện thế 240 V thì electron có vận tốc 10 7 m/s. Khi qua điểm N electron có vận tốc 216.10 5 km/h. Điện thế tại điểm N có giá trị là A.298 V. B.-64 V. C.58 V. D.120 V.
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