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What is the electric potential energy of a system of two point charges Q1 and Q2

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Question: What is the electric potential energy of a system of two point charges Q1 and Q2 separated by a distance r?

Options:

  1. kQ1Q2/r
  2. kQ1Q2/2r
  3. kQ1Q2/r²
  4. kQ1Q2

Correct Answer: kQ1Q2/r

Solution: 

The electric potential energy U of a system of two point charges is given by U = kQ1Q2/r.

What is the electric potential energy of a system of two point charges Q1 and Q2

Practice Questions

Q1
What is the electric potential energy of a system of two point charges Q1 and Q2 separated by a distance r?
  1. kQ1Q2/r
  2. kQ1Q2/2r
  3. kQ1Q2/r²
  4. kQ1Q2

Questions & Step-by-Step Solutions

What is the electric potential energy of a system of two point charges Q1 and Q2 separated by a distance r?
  • Step 1: Identify the two point charges in the system, which are Q1 and Q2.
  • Step 2: Measure the distance between the two charges, which is denoted as r.
  • Step 3: Understand that k is a constant called Coulomb's constant, which is approximately 8.99 x 10^9 N m²/C².
  • Step 4: Use the formula for electric potential energy, which is U = k * Q1 * Q2 / r.
  • Step 5: Plug in the values of Q1, Q2, r, and k into the formula to calculate U.
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