In an `LR` circuit, current at `t = 0` is `20 A`. After `2 s` it reduces to `18 A`. The time constant of the circuit is :

In an LR circuit, current at t=0 is 20A . After 2s it reduced to 18A. The time constant of the circuit is (in second)

In an LR circuit, current at t=0 is 2A . After 2s it reduced to 18A. The time constant of the circuit is (in second)

Time constant of LR circuit will be

Time constant of LR circuit will be

In an LR-circuit the current attains one-third of its final steady value in 5s. What is the time-constant of the circuit ? (log_(2) = 0.405)

The current in a LR circuit builds up to (3)/(4)th of its steady state value in 4s . The time constant of this circuit is

The current in a LR circuit builds up to (3)/(40th of its steady state value ion 4s . The time constant. Of this circuit is

A coil carrying a steady current is short-circuited. The current in it decreases alpha times in time t_(0) . The time constant of the circuit is

A coil carrying a steady current is short-circuited. The current in it decreases alpha times in time t_(0) . The time constant of the circuit is

The current in a LR circuit builds up to 3/4 th of its steady state value in 4s. The time constant of this circuit is