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Two identical charged particles each having a mass 10 g and charge 2.0 × 10 –7 C are placed on a horizontal table with a separation of L between them such that they stay in limited equilibrium. If the coefficient of friction between each particle and the table is 0.25, find the value of L. [Use g = 10 ms –2 ]

1. 12 cm
2. 10 cm
3. 8 cm
4. 5 cm

Correct answer: 12 cm

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