Answer to Question 9

 

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The solenoid above is carrying a current of 4.5 A, as in Question 8.  When the current is turned off, it falls to zero in 10 ms.  

What is the value of the voltage induced?

L  = 0.021 H

 

E = - 0.021 H (4.5 A 0.01 s) = -9.45 V