Question: A solenoid 25.0 cm long and with a cross-sectional area of 0.500 cm2 contains 400 turns of wire and carries a current of 80.0 A.

A solenoid 25.0 cm long and with a cross-sectional area of 0.500 cm2 contains 400 turns of wire and carries a current of 80.0 A. Calculate:
(a) The magnetic field in the solenoid;
(b) The energy density in the magnetic field if the solenoid is filled with air;
(c) The total energy contained in the coil's magnetic field (assume the field is uniform);
(d) the inductance of the solenoid.

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