A coil of resistance 10 Ω and inductance 5 H is connected to a 100 V battery. Then the energy stored in the coil is

Question

A coil of resistance 10 Ω and inductance 5 H is connected to a 100 V battery. Then the energy stored in the coil is (A) 250 J (B) 250 erg (C) 125 J (D) 125 erg

Tardigrade Admin · Accepted Answer

Final current, I=(E/R) I=10 A Energy stored in the magnetic field U=(1/2) Li (1/2)×5×(10)2=250 J

Q. A coil of resistance $10 Ω$ and inductance $5 H$ is connected to a $100 V$ battery. Then the energy stored in the coil is

$250 J$

$250 er g$

$125 J$

$125 er g$

Final current, $I = \frac{E}{R}$
$I = 10 A$
Energy stored in the magnetic field
$U = \frac{1}{2} L i$
$\frac{1}{2} \times 5 \times (10)^{2} = 250 J$

Q. A coil of resistance 10Ω and inductance 5H is connected to a 100V battery. Then the energy stored in the coil is

250J

250erg

125J

125erg