Discussion
Consider the following statements about field energy.
1. Energy density goes as the square of the field 2. Assembling like charges requires work 3. The energy of a bound pair of opposite charges is positive
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: the density goes as \( E^2 \), and assembling like charges requires work against their repulsion. Statement 3 has the sign wrong - a bound pair of opposite charges has negative energy, since work would have to be done to separate them, and that is precisely what being bound means.
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