A) 80 J
B) 0.08 J
C) 0.8 J
D) 8 J
Correct Answer: B
Solution :
An inductor has the capability of storing energy in its magnetic field. Hence, stored energy \[U=\frac{1}{2}L{{i}^{2}}\] Here, \[i=2A,L=40\,mH=40\times {{10}^{-3}}H\] \[\therefore \] \[U=\frac{1}{2}\times 40\times {{10}^{-3}}\times {{(2)}^{2}}\] \[=0.08\,J\] Note: Energy stored in inductor is similar to energy of a capacitor stored in the electric field between its plates.
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