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Question

Consider the situation shown in the figure. What are the signs of q1 and q2? If the lines are drawn in proportion to the charges, what is the ratio q1/q2?

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Solution

The electric lines of force are entering charge q1; so, it is negative. On the other hand, the lines of force are originating from charge q​​​2; so, it is positive. If the lines are drawn in proportion to the charges, then
q1q2=618⇒q1q2=13
6 lines are entering q​​​1 and 18 are coming out of q​​​2.

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