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Investigate, deduce, compare, and discuss the magnetic field expressions at the center of a loop: a)...

Investigate, deduce, compare, and discuss the magnetic field expressions at the center of a loop:
a) one turn, against b) a solenoid of N turns in the same place, c) with a solenoid of N turns distributed over a certain distance L (coil length) and d) of a toroid.
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