What is the electrostatic energy density stored in an electric field of magnitude in vacuum? ()
Answer and explanation
Correct answer: A.
- Step 1: State the electrostatic energy density formula: .
- Step 2: Substitute values: and .
- Step 3: Calculate: .
Answer
.
Why not the others: omits the factor of (calculating ); multiplies by 2; divides by an extra factor of 2.
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