Question: A solenoid has 120 turns uniformly wrapped around a wooden core, which has a diameter of 10.0 mm and a length of 9.00 cm. (a)

A solenoid has 120 turns uniformly wrapped around a wooden core, which has a diameter of 10.0 mm and a length of 9.00 cm.
(a) Calculate the inductance of the solenoid.
(b) What If? The wooden core is replaced with a soft iron rod that has the same dimensions, but a magnetic permeability 'm = 800'0. What is the new inductance?

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