Answer to Question 4

 

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A solenoid consists of 300 turns and is 5 cm long.  It is carrying a current of 1.5 A.   It has a core of relative permeability 150.

Calculate the energy density.

Calculate the number of turns per metre:

n = 300 turns 0.050 m = 6000 m-1

 

U = [4p 10-7 H m-1 150 (6000 m-1 )2 (1.5 A)2 ] 2 = 7600 J m-3