What diagram would have the largest current?

Question

Put in order from smallest to largest please?&explain why you chose the highest one:)
100 turn coil on wooden frame with magnet below,coil leads and rotating.
50 turn coil on wooden frame with magnet below,coil leads and rotating.
100 turn coil on iron frame with magnet above and below,coil leads and rotating.
100 turn cool on wooden frame with magnet above and below,coil leads and rotating.

Anonymous · Accepted Answer

100 turn coil on iron frame with magnet above and below,coil leads and rotating.- would be the highest, because there are the most turns, and iron frame channels the magnetic field.

Len · Answer

Inductor Design.
(1) Single layer air cored. L = N2Â²rÂ² / 254(0.9+I)
       L = inductance in uH. N = number of turns. I = coil length in mm. r = coil radius in mm.
(2) Multi-layer air cored, height equal to inner radius.
       H = 0.34 âL/R.  N = 19.9 âL/H. 
       L = inductance in uH. N = number of turns. H = coil height in mm. d = wire diam. in mm. 
       R = coils d.c. resistance in Ohms.
(3) Multi-layer with height half the inner radius.
      H = 0.323 âL/R. N = 13.2âL/H. d = 0.736H/âN. symbols the same as (2).
(4) Coils wound on ferrite toroids or similar.
       N = TâL/AL.
      L = inductance of coil. A = the inductance of T turns of the particular core.
Coils wound on ferrites having an open loop, their design is based on the formula for air coiled coils, as shown in (1). The final inductance is usually found by trial and error but is typically 2 to 3 times the air cored inductance.

A coil on a wooden frame is an air cored inductor.

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What diagram would have the largest current?

2 Answers