An inductor is connected to a voltage source and it is found that it has a time constant, t. When a 10-ohm resistor is placed in series with the inductor, the time constant becomes t/2. A pure inductance of 30 mH is placed in series with the original inductor and the 10-ohm resistor, the time constant is t. What are the values of the original inductors (a) inductance, (b) internal resistance

A) 30 mH

B ) 10-ohm

Explanation:

resistor = 10-ohm

Inductor = 30mH ( l )

L = inductance

R = resistance

r = internal resistance

values of the original Inductors

Note : inductor = constant time (t)  case 1

inductor + 10-ohm resistor connected in series = constant time ( t/2) case2

inductor + 10-ohm resistor + 30 mH inductance in series = constant time (t) case3

From the above cases

case 1 = time constant ( t ) = L / R

case 2 = Req = R + r hence time constant  t / 2  = L / R + r  therefore

t =

case 3 = Leq = L + l , Req = R + r .  constant time ( t )

hence Z = = t

A) Inductance

To calculate inductance equate case 1 to case 3

= =   L / 10 = (L + 30) / ( 10 + 10 )

= 20 L = 10 L + 300 mH

   10L = 300 m H

therefore L = 30 mH

B ) The internal resistance

equate case 1 to case 2

=

R + r = 2 R  therefore  ( r = R )   therefore internal resistance = 10-ohm

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