When an rl circuit is connected to a battery, what happens to the current in the circuit?
o it is initially at its maximum value and then decreases linearly with time.
o it is initially at its maximum value and then decreases exponentially with time.
o it is initially 0 and then increases exponentially with time.
o it is constant during the charging.
o it is initially 0 and then increases linearly with time.

It is initially 0 and then increases exponentially with time

Explanation:

When battery is connected to RL circuit

Current varies according to

where

t=time

R=Resistance

L=Inductance

and Potential difference across Resistor is given by

where

At t=0 i=0 and as time increase value of increases exponentially

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.