Answer to Question 3

 

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How much flux is on the face of a face magnet if it measures 2 cm by 5 cm and the flux density is 20 mT?

 Area of magnet = 0.02 m 0.05 m = 1.0 10-3 m2

    F = 20 10-3 T 1.0 10-3  m2 = 2 10-5 Wb