The inductor in an LR circuit (see figure E20.1b) initially carries a current $I_{0}$ and therefore contains a certain amount of energy in its magnetic field. By the time that the current has decayed to half its initial value, what fraction of the inductor's magnetic field energy has been converted to thermal energy in the circuit's resistor?

A) $7 / 8$
B) $3 / 4$
C) $1 / 2$
D) $1 / 4$
E) $1 / 8$
F) Some other fraction (specify).

Question

The inductor in an LR circuit (see figure E20.1b) initially carries a current $I_{0}$ and therefore contains a certain amount of energy in its magnetic field. By the time that the current has decayed to half its initial value, what fraction of the inductor's magnetic field energy has been converted to thermal energy in the circuit's resistor?

A) $7 / 8$ 
B) $3 / 4$ 
C) $1 / 2$ 
D) $1 / 4$ 
E) $1 / 8$ 
F) Some other fraction (specify).

Quizplus · Accepted Answer

The Answer of The inductor in an LR circuit (see figure E20.1b) initially carries a current $I_{0}$ and therefore contains a certain amount of energy in its magnetic field. By the time that the current has decayed to half its initial value, what fraction of the inductor's magnetic field energy has been converted to thermal energy in the circuit's resistor?

A) $7 / 8$ 
B) $3 / 4$ 
C) $1 / 2$ 
D) $1 / 4$ 
E) $1 / 8$ 
F) Some other fraction (specify).

The Inductor in an LR Circuit (See Figure E20 I0I_{0}I0​ And Therefore Contains a Certain Amount of Energy in Its

The Inductor in an LR Circuit (See Figure E20 $I_{0}$ And Therefore Contains a Certain Amount of Energy in Its