Answer to Question 6

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A solenoid has 150 turns wound over a former that is 10 cm long and is of uniform circular cross-section diameter 3.0 cm.  A current of 5.6 A flows through it.  Calculate the flux that it produces.

F = m0AnI

A = p (1.5 10-2 m)2 = 7.069 10-4 m2

n = 150 0.10 m = 1500 m-1

F = 4p 10-7 H m-1 7.069 10-4 m2 1500 m-1 5.60 A

F = 7.46 10-6 Wb = 7.5 10-6 Wb (2 s.f.)