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The electric field E due to a point charge at any point near it is defined as $E=\lim\limits_{q \to 0} \frac{F}{q} $ , where q is the test charge and F is the force acting on it. What is the physical significance of $\lim\limits_{q \to 0} $ in this expression? Draw the electric field lines of a point charge Q when $(i) Q > 0$ and $(ii) Q < 0.$

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