Three charges `q_1 = 1 mu C, q_2 = -2 mu C, and q_3 = -1 mu C` are placed at `A (0,0,0), B(-1 , 2,3,) and C (2 , -1, 1)`. Find the potential of the system of three charges at `P( 1, - 2, -1)`.

Explanation

To find the electric potential at point P(1, -2, -1) due to the three charges \( q_1 = 1 \mu C \), \( q_2 = -2 \mu C \), and \( q_3 = -1 \mu C \) located at points A(0, 0, 0), B(-1, 2, 3), and C(2, -1, 1) respectively, we can follow these steps:

### Step 1: Calculate the distances from point P to each charge.
We will use the distance formula in three-dimensional space, which is given by:

\[ r = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2 + (z_2 - z_1)^2} \]
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