What's the time constant of a 10 H inductor and a 200 ohm resistor connected in series
A. 5 msec
B. 50 msec
C. 5 usec
D. 50 psec

Solution:

Given that,

10 H inductor and a 200 ohm resistor connected in series

To find: time constant

The time constant in seconds is given as:

Where,

L is the inductance in henry and R is the resistance in ohms

Convert to millisecond

1 second = 1000 millisecond

0.05 second = 0.05 x 1000 = 50 millisecond

Thus time constant is 50 millisecond