4. (3 pts.) Suppose that you create a simple electromagnet at home by evenly wrapping a…

4. (3 pts.) Suppose that you create a simple electromagnet at home by evenly wrapping a thin copper wire 550 times around an 8.0-cm-long iron rod. You then connect the wire to a battery that passes 250 mA through the wire. The iron rod has a radius of 6.0 mm and a magnetic permeability le-150__. Assuming that this forms an “ideal” solenoid, find the strength of the magnetic field generated inside (and near the ends of) the electromagnet.

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