Answer to Question 7

 

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A solenoid has a diameter of 2.0 cm and a length of 5.0 cm.  It has 150 turns and the core has a relative permeability of 120.

What is the inductance?

Work out the area first:

A = p (1.0 10-2 m)2 = 3.14 10-4 m2

 

L =  (3.14 10-4 m2 4p 10-7 H m-1 120 1502 ) 5.0 10-2 m = 0.021 H