A solenoid has a length of 25 cm, a radius of 1 cm, 400 turns, and carries a 3 A-current. a) Find the magnetic field on the axis at the center of the solenoid. b) Find the flux through the solenoid, assuming B to be uniform. c) Find the self-inductance of the solenoid. d) Find the magnitude of the induced emf in the solenoid when the current changes at 150 A/s.

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