How many time constants one should wait for the current in an LR-circuit to grow within 0.1% of its steady state value.

How many time constants will elapse before the current in a charging R-C circuit drops to half of its initial value?

How many time constants will elapse before the current in a charging RC circuit drops to half of its initial value?Answer the same question for a discharging RC circuit.

How many time constants will elapse before the charge on a capacitor falls to 0.1% of its maximum value in a discharging RC circuit.

Find the value of t/tau for which the current in an LR circuit builds up to (a) 90%, (b) 99% and ( c) 99.9% of the steady-state value.

A coil inductance L and resistance R is connected to a constant voltage source. How soon will the coil current attains eta(etalt1) fraction of the steady state value?

Find the time after which current in the circuit becomes 80% of its maximum value

A coil is connected to a battery of 12 V emf and negligible resistance. The current in the solenoid grows to 63% of its final steady state value in 0.3 s . If the final steady state current is 0.6A , the inductance of the solenoid is