First slide

Inductance

Question

In the figure, magnetic energy stored in the coil is

Moderate

A

Zero
B

Infinite
C

25 joules
D

None of the above

Solution

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

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