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The two images you've uploaded show an electrostatics problem with point charges placed on a coordinate system. Let me summarize and analyze the scenario in detail.

**Image 1:**
- You have charges \( q_2 = -5.50 \, \mu C \) fixed at the origin of the coordinate system.
- Another charge \( q_1 = 2.50 \, \mu C \) is initially located at point \( P \), a distance \( d_1 = 5.00 \, \text{cm} \) from the origin along the x-axis.
- Point \( R \) is located along the x-axis, at a distance \( d_2 = 2.00 \, \text{cm} \) from the origin.
- Additionally, there are charges \( q_3 \) and \( q_4 \), each with magnitudes of \( 2.75 \, \mu C \), half the value of \( q_2 \), located a distance \( a = 1.20 \, \text{cm} \) from the origin along the y-axis.

**Image 2:**
- The scenario is modified by replacing charge \( q_4 \) with charge \( q_5 \), which has the same magnitude \( q_5 = 2.75 \, \mu C \) but an opposite sign from \( q_4 \).

### Electrostatics Analysis:
You are likely being asked to calculate the net electrostatic force on one of the charges due to the presence of the others using Coulomb's law:

\[
F = k_e \frac{|q_1 q_2|}{r^2}
\]
where \( k_e = 8.99 \times 10^9 \, \text{N} \cdot \text{m}^2/\text{C}^2 \) is Coulomb's constant, \( q_1 \) and \( q_2 \) are the charges, and \( r \) is the distance between the charges.

To calculate forces between charges, you’ll need to:
1. Compute the individual forces between the charges on a specific point (e.g., \( q_1 \) at \( P \)).
2. Decompose forces into x and y components if necessary.
3. Sum the forces vectorially to find the net force.

Do you need a step-by-step solution for a particular charge, such as calculating the force on \( q_1 \) at point \( P \), or another part of the problem? Let me know how you'd like to proceed!

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### 5 Related Questions:
1. How do we calculate the electric field at a point due to multiple charges?
2. What happens to the force if both charges are negative?
3. How do you decompose forces into vector components in 2D space?
4. How does the superposition principle apply to forces in this setup?
5. What is the effect of charge magnitude on the force between two charges?

**Tip:** Always consider both the magnitude and direction when adding forces in 2D or 3D problems.

A point charge q2 = -5.50 μC is fixed at the origin of a coordinate system. Another point charge q1 = 2.50 μC is initially located at point P, a distance d1 = 5.00 cm from the origin along the x-axis. Point R is located on the x-axis a distance d2 = 2.00 cm from the origin. The two charges q3 and q4 each have a magnitude of 2.75 μC, half that of q2. The charges are located a distance a = 1.20 cm from the origin along the y-axis. In the next scenario, charge q4 is replaced by charge q5, which has the same magnitude but opposite sign (q5 = 2.75 μC).

Analyze an electrostatic setup with charges q1, q2, q3, and q4 (or q5) placed on a coordinate system. Calculate the net force on a charge using Coulomb's law and vector addition, considering the magnitude and direction of the forces. Suitable for advanced high school and undergraduate physics students.

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