Answer to Question 1

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= -N DF/Dt  and DF = BDA

 

0.75 V = (-) 2500 B (0 - 1.5 10-4 m2)  

                               0.3 s

 

 

B =      0.75 V 0.3 s 

       2500 1.5 10-4 m2

 

 

B = 0.6 T