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Question
Choose the correct option:
Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?
Options
20 mH
30 mH
10 mH
`20/3` mH
Solution
30 mH
Explanation:
Step 1:
Let Ls = the resultant inductance of the combination of the two coils.
Substitute the given values from Question,
`L_1 = 10 mH` ......(1)
`L_2 = 20 mH` ......(2)
Applying the concept of combination of the two coils of Inductors in Series
We get, `L_s = L_1 + L_2` .....(3)
Step 2:
Substitute from (1), (2) and (3) and calculate:
`L_s = 10 + 20`
`L_s = 30 mH`
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