Question: A soft iron rod ('m = 800'0) is used as the core of a solenoid. The rod has a diameter of 24.0 mm and is

A soft iron rod ('m = 800'0) is used as the core of a solenoid. The rod has a diameter of 24.0 mm and is 10.0 cm long. A 10.0-m piece of 22-gauge copper wire (diameter = 0.644 mm) is wrapped around the rod in a single uniform layer, except for a 10.0-cm length at each end, which is to be used for connections.
(a) How many turns of this wire can be wrapped around the rod? For an accurate answer you should add the diameter of the wire to the diameter of the rod in determining the circumference of each turn. Also note that the wire spirals diagonally along the surface of the rod.
(b) What is the resistance of this inductor?
(c) What is its inductance?

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