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Q.
The given figure gives electric lines of force due to two charges $q_1$ and $q_2$. What are the signs of the two charges?
Electromagnetic Induction
Solution:
The electric lines of force are directed from higher potential to lower potential. The lines are directed towards $q_1$ and $q_2$ from neighbouring points, so $q_1$ and $q_2$ both are negative (at lower potential).