A particle of charge `3.00 mu C` is separated by 0.120 m from a particle of charge `-1.50 mu C`. (a) What is the magnitude of the electrostatic force between them ? (b) What must their separation be to reduce that force by an order of magnitude ?

Explanation

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

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

1. **Identify the Charges and Distance**:
- Charge \( Q_1 = 3.00 \, \mu C = 3.00 \times 10^{-6} \, C \)
- Charge \( Q_2 = -1.50 \, \mu C = -1.50 \times 10^{-6} \, C \)
- Distance \( r = 0.120 \, m \)
...