Magnetism and Electromagnetism - General Questions (2)

The direction of a magnetic field within a magnet is

What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

The unit for permeability is

What is the flux density in a magnetic field in which the flux in 0.1 m² is 600 Wb?

A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

The unit for reluctance is