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Electronic Devices and Circuits - Engineering

Q1:

The inductance of a single layer solenoid of 10 turns is 5 μH. Which one of the following is the correct value of inductance when the number of turns is 20 and the length is doubled.

A 10 μH

B 20 μH

C 40 μH

D 5 μH

ANS:A - 10 μH

Inductance = (u N^2A)/lenth.
L1 =(u*10^2 A)/length =(u* 100A)/lenght = 5 micro henery.
L2 =u*20^2A)/2*length = 2 ((u* 100A)/lenght) = 10 micro henry.