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  4. Which of the following graphs shows the correct variation of force when the distance r between two charges varies?

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Q. Which of the following graphs shows the correct variation of force when the distance $r$ between two charges varies?

Electric Charges and Fields

Solution:

From Coulomb's law $F=\frac{ Kq _1 q _2}{ r ^2}$
i.e., $F \propto \frac{1}{ r ^2}$ which is correctly shown by graph (d).