Answer to Question 2

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Original flux linkage = 0.05 Wb

New flux linkage =  200 2.5 10-3 T 0.1 m2  sin 60

= 0.05 Wb 0.866 = 0.0433 Wb

DF = 0.0433  Wb    0.05  Wb = - 6.7 10-3 Wb