Discussion
Two charges of \( +2 \) nC are 1 m apart. The energy stored in the system is about
Answer: B
The energy is the product of the charges over \( 4\pi\epsilon_0 \) times the separation, \( 9 \times 10^{9} \times 4 \times 10^{-18}/1 = 3.6 \times 10^{-8} \) J. It is positive because work was needed to bring like charges together.
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