Bài 2 : Tại hai điểm A và B đặt hai điện tích điểm q1 = 20.10-6C và q2 = -10.10-6C cách nhau 40 cm trong chân không.
a) Tính cường độ điện trường tổng hợp tại M trung điểm AB.
b) Tính cường độ điện trường tại N cách A 10cm, cách B 30cm
c) Tính cường độ điện trường tại O cách A 20cm, cách B 60cm
d) Tìm vị trí cường độ điện trường tổng hợp hai điện tích bằng 0 ?
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