Two tiny, spherical water drops, with identical charges of `-1.00 xx 10^(-16)C`, have a center-to-center separation of 1.20 cm. (a) What is the magnitude of the electrostatic force acting between them ? (b) How many excess electrons are on each drop, giving it its charge imbalance ?

Explanation

To solve the problem, we will break it down into two parts as specified in the question.

### Part (a): Calculate the Magnitude of the Electrostatic Force

1. **Identify the Given Values:**
- Charge of each drop, \( Q = -1.00 \times 10^{-16} \, \text{C} \)
- Distance between the centers of the drops, \( r = 1.20 \, \text{cm} = 0.0120 \, \text{m} \)
- Coulomb's constant, \( k = \frac{1}{4\pi \epsilon_0} \approx 9.0 \times 10^9 \, \text{N m}^2/\text{C}^2 \)
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