Math Problem Statement

Three charges q1 = 77.3 nC, q2 = 95.5 nC, q3 = 94 nC are arranged on the vertices of an equilateral triangle with side length 0.024 m. A fourth charge q4 = 11.4 nC is placed at the center of the triangle. (Remember that for an equilateral triangle of side length L, the distance between a vertex and the center of the triangle is (\sqrt(3))/(3)). Give all answers to three significant figures. The angle at q1 is 60 degrees. What is the x component of the force q1 exerts on q4?

Solution

To calculate the x-component of the force that q1q_1 exerts on q4q_4, we will follow these steps:

Step 1: Calculate the distance between q1q_1 and q4q_4

For an equilateral triangle with side length L=0.024mL = 0.024 \, \text{m}, the distance between a vertex and the center of the triangle is:

r=L33=0.02433r = \frac{L \cdot \sqrt{3}}{3} = \frac{0.024 \cdot \sqrt{3}}{3}

Let's calculate this value first.

Step 2: Calculate the force magnitude between q1q_1 and q4q_4

Using Coulomb's law, the magnitude of the force between two charges is:

F=keq1q4r2F = k_e \frac{|q_1 \cdot q_4|}{r^2}

where ke=8.99×109Nm2/C2k_e = 8.99 \times 10^9 \, \text{N} \cdot \text{m}^2 / \text{C}^2, and rr is the distance from q1q_1 to q4q_4.

Step 3: Find the x-component of the force

The force exerted by q1q_1 on q4q_4 makes an angle of 6060^\circ with the x-axis. The x-component of the force is:

Fx=Fcos(60)=F2F_x = F \cdot \cos(60^\circ) = \frac{F}{2}

Now, let's compute these values step by step.

First, we'll calculate rr.The distance between q1q_1 and q4q_4 is approximately 0.0139m0.0139 \, \text{m}.

Now let's calculate the force magnitude FF using Coulomb's law:

F=keq1q4r2F = k_e \frac{|q_1 \cdot q_4|}{r^2}

where:

  • q1=77.3×109Cq_1 = 77.3 \times 10^{-9} \, \text{C}
  • q4=11.4×109Cq_4 = 11.4 \times 10^{-9} \, \text{C}
  • ke=8.99×109Nm2/C2k_e = 8.99 \times 10^9 \, \text{N} \cdot \text{m}^2 / \text{C}^2
  • r=0.0139mr = 0.0139 \, \text{m}

Let's compute the force.The magnitude of the force between q1q_1 and q4q_4 is approximately 0.0413N0.0413 \, \text{N}.

Now, let's calculate the x-component of this force:

Fx=F2F_x = \frac{F}{2}

Let me compute that for you.The x-component of the force that q1q_1 exerts on q4q_4 is approximately 0.0206N0.0206 \, \text{N}.

Would you like any further details or clarification?

Here are 5 related questions for further exploration:

  1. What is the y-component of the force q1q_1 exerts on q4q_4?
  2. What is the net force on q4q_4 due to all three charges q1q_1, q2q_2, and q3q_3?
  3. How does the force change if q4q_4 is moved closer to one of the charges?
  4. What is the potential energy of the system due to these four charges?
  5. How would the force change if the charges were doubled?

Tip: When dealing with forces in a symmetrical arrangement, breaking them into components can significantly simplify the calculation.

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Math Problem Analysis

Mathematical Concepts

Electrostatics
Vector Components
Coulomb's Law

Formulas

Coulomb's Law: F = k_e * (|q1 * q4|) / r^2
Vector Component: Fx = F * cos(θ)
Distance from vertex to center in an equilateral triangle: r = (L * √3) / 3

Theorems

Coulomb's Law

Suitable Grade Level

Undergraduate Physics or Advanced High School (Grades 11-12)