1) A coil of resistance 10Ω and an inductance 5H is connected to a 100 V battery. The energy stored in the coil is A) 325 erg B) 125J C) 250erg D) 250J Answer: Option DExplanation:Current $I=\frac{V}{R}=\frac{100}{10}=10A$ Energy , $E= \frac{1}{2}LI^{2}$ $= \frac{1}{2}\times 5 \times (10)^{2}=250 J$
