When an rl circuit is connected to a battery, which is true about its initial and final states?
a. it initially acts like a broken wire and finally acts like ordinary connecting wire.
b. it initially acts like ordinary connecting wire and finally acts like a broken wire.
c. it acts like broken wire throughout the charging.
d. it acts like ordinary connecting wire throughout the charging.

A

Explanation:

In R-L circuit current is given by

where i=current at any time t

R=resistance

L=Inductance

at t=0 approaches to 1

therefore

i=0

when t approaches to ,   approaches to zero

thus

thus we can say that initially circuit act as broken wire with zero current

and it increases exponentially with time and act as ordinary connecting wire

answer; i believe that the correct answer is (d) a very small amount of mass

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hope this !