99 \times 10^9 \, \text{N m}^2/\text{C}^2 \)),
- \( q_1 \) and \( q_2 \) are the magnitudes of the charges,
- \( r \) is the separation between the charges.
Given:
- \( q_1 = 3.5 \, \text{C} \)
- \( q_2 = -4.5 \, \text{C} \)
- Initial separation \( r = 2.8 \,
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