Answer to Question 1

 

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A solenoid of 2.3 10-2 H and negligible resistance is connected across a 12 V battery.  What is the rate of increase of current in the solenoid as its turned on?

 

12 V = 2.3 10-2 H dI/dt
 

dI/dt = 12 V 2.3 10-2  H = 522 A s-1