What is the electrostatic force of attraction between the two plates of a parallel plate capacitor carrying charge and having plate area ?
Answer and explanation
Correct answer: B.
- Step 1: The electric field produced by one charged plate alone is .
- Step 2: The charge on the opposing plate experiences an electrostatic force in this field: .
- Step 3: Multiply charge by the field: .
Answer
.
Why not the others: incorrectly uses the total electric field between both plates instead of the field due to a single plate; divides by 4; multiplies by 2.
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