A coil resistance 20 Ω and inductance 5 H is connected with a 100 V battery. Energy stored in the coil will be

Question

A coil resistance 20 Ω and inductance 5 H is connected with a 100 V battery. Energy stored in the coil will be (A) 41.5 J (B) 62.50 J (C) 125 J (D) 250 J

Tardigrade Admin · Accepted Answer

U=(1/2) L i2 =(1/2) L((E/R))2 =(1/2) × 5 ×((100/20))2 =62.50 J

Q. A coil resistance $20 Ω$ and inductance $5 H$ is connected with a $100 V$ battery. Energy stored in the coil will be

41.5 J

62.50 J

125 J

250 J

$U = \frac{1}{2} L i^{2}$
$= \frac{1}{2} L (\frac{E}{R})^{2}$
$= \frac{1}{2} \times 5 \times (\frac{100}{20})^{2}$
$= 62.50 J$

Q. A coil resistance 20Ω and inductance 5H is connected with a 100V battery. Energy stored in the coil will be