A) 10J
B) 20J
C) 30 J
D) 40 J
Correct Answer: B
Solution :
Given: \[R=50\,\Omega ,L=10\,\Omega ,V=100\,\,V\] Energy stored in coil \[U=\frac{1}{2}L{{i}^{2}}\] \[=\frac{1}{2}L{{\left( \frac{V}{R} \right)}^{2}}\] \[=\frac{1}{2}L.\frac{{{V}^{2}}}{{{R}^{2}}}\] \[=\frac{1}{2}\times 10\times \frac{100\times 100}{50\times 50}\] \[=20\,J\]You need to login to perform this action.
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