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What is the electric field (E) due to a point charge (Q) at a distance (r)?

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Question: What is the electric field (E) due to a point charge (Q) at a distance (r)?

Options:

  1. E = k * Q / r^2
  2. E = k * Q * r^2
  3. E = Q / (4 * π * ε * r)
  4. E = Q / (4 * π * ε * r^2)

Correct Answer: E = k * Q / r^2

Solution: 

The electric field due to a point charge is given by E = k * Q / r^2.

What is the electric field (E) due to a point charge (Q) at a distance (r)?

Practice Questions

Q1
What is the electric field (E) due to a point charge (Q) at a distance (r)?
  1. E = k * Q / r^2
  2. E = k * Q * r^2
  3. E = Q / (4 * π * ε * r)
  4. E = Q / (4 * π * ε * r^2)

Questions & Step-by-Step Solutions

What is the electric field (E) due to a point charge (Q) at a distance (r)?
  • Step 1: Identify the point charge (Q) you are interested in.
  • Step 2: Measure the distance (r) from the point charge to the point where you want to find the electric field.
  • Step 3: Use the constant k, which is approximately 8.99 x 10^9 N m^2/C^2.
  • Step 4: Plug the values of Q and r into the formula E = k * Q / r^2.
  • Step 5: Calculate the value of E to find the electric field at that distance.
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