Question

In the figure, magnetic energy stored in the coil is

• A. Zero
• B. Infinite
• C. 25 joules
• D. None of the above

Answer 1

Answer: (C)

$i=\frac{V}{R}=\frac{10}{52}=5A$
$U=\frac{1}{2}L{i}^2$
$=\frac{1}{2}\times 2\times 25=25J$