Two point charges `Q_1` and `Q_2` lie along a line at a distance from each other. Figure 3.7 shows the potential variation along the line of charges. At which of the points 1, 2, and 3 is the electric field zero ? What are the singns of the charges `Q_1` and `Q_2` and which of the two charges is greater in magnitude ?
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Answer

(a). `q_(1)tove;q_(2)to-ve`
`q_(1)` has larger magnitude
(b). `(d)/(sqrt(3)-1)`