A) 0.4 J
B) 4.0 J
C) 0.8 J
D) 0.04 J
Correct Answer: A
Solution :
\[U=\frac{1}{2}L{{i}^{2}}=\frac{1}{2}\times (50\times {{10}^{-3}})\times {{(4)}^{2}}\]\[=400\times {{10}^{-3}}=0.4J\]
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