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A solenoid has n= 120 turns per meter, and it is filled with a ferromagnetic material (km = 65).
When the current through the solenoid is increasing at the rate of 2.0 A/s, the voltage induce in
the solenoid is 25 V.
a. Determine the inductance of the solenoid.
b. What is the magnitude of the induced electric field inside of the solenoid at the radial
distance r= 0.020 m from the axis of the solenoid?

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