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The Solenoid

number of turns
attract
Lighter
:Darker[ColorData[97][2],0.7] should be a valid color directive, an image, or a list of them.
Lighter
:Darker[ColorData[97][1],0.58] should be a valid color directive, an image, or a list of them.
Lighter
:Darker[ColorData[97][3],0.75] should be a valid color directive, an image, or a list of them.
General
:Further output of Lighter::arg will be suppressed during this calculation.
MapThread
:Object ColorData[97,ColorList]{2,1,3,4,5,6,7,8,9,10} at position {2, 2} in MapThread[{Specularity[White,#1],#2,Lighting#3}&,{{3,3,3,6,6,6,6,3,6,6},1,{{{Ambient,Lighter[Darker[ColorData[1][1],0.7],0.05]},{Directional,Darker[ColorData[97][2],0.7],ImageScaled[{0,2,2}]},{1},{Directional,Darker[ColorData[97][2],0.7],ImageScaled[{2,0,2}]}},9}}] has only 0 of required 1 dimensions.
A solenoid consists of an insulated wire twisted around a metallic rod (typically iron). It yields a magnetic field as long as a current runs through the windings. The strength of the magnetic field is proportional to the number of turns of wire. Its advantage over a permanent magnet is that the intensity of the magnetic field can be varied and turned on and off. In the graphic, as electricity is supplied by a battery, the nail and the clip are attracted to the solenoid.
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