A) \[0.2\,\,J\]
B) \[0.4\,\,J\]
C) \[0.05\,\,J\]
D) \[0.1\,\,J\]
Correct Answer: B
Solution :
Energy stored in an inductor, is given by \[E=\frac{1}{2}L{{i}^{2}}\] Given, \[L=50\,\,mH=50\times {{10}^{-3}}H,\,\,i=4\,\,A\] \[\therefore \] \[E=\frac{1}{2}\times 50\times {{10}^{-3}}\times {{(4)}^{2}}\] \[\Rightarrow \] \[E=0.4\,\,J\]
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