Answer to Question 9

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Calculate the flux density in the centre of a coil of 30 turns of diameter 10 cm when a current of 3.6 A is flowing in the coil.

B = (4p 10-7 H m-1 30 3.6 A) (2 0.050 m)

B = 1.36 10-3 T = 1.4 mT