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huynhvien2001
2 năm trước
Một quả cầu nhỏ A mang điện tích âm Q= -10 ^-7 C đặt trong dầu hỏa có &= 2 tính : A. cường độ điện trường do quả cầu u gây ra tại điểm M cách a 15 cm. B. lực điện ép do điện trường của quy tác dụng lên quả cầu nhỏ B mang điện tích q =-4 .10 ^7 C tại điểm M.
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