Magnetic energy stored in an inductor of given inductance and current

1. A.
   10 mJ
2. B.
   5 mJ
3. C.
   $10\,\mu J$
4. D.
   $5\,\mu J$

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1. A.
   0.025 J
2. B.
   0.050 J
3. C.
   0.075 J
4. D.
   0.100 J

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1. A.
   $4.5$ mJ
2. B.
   $3\ \mu\mathrm{J}$
3. C.
   $45\ \mu\mathrm{J}$
4. D.
   $4500$ mJ

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