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Toroid

A toroid can be considered as a ring shaped closed solenoid (Fig. 21). Hence, it is like an endless cylindrical solenoid.
 
83593.png
Fig. 21
 
Consider a toroid having n turns per unit length (Fig. 22). Magnetic field at point P in Fig. 22 is given as
 
82132.png, where n = N/2πr
 
84567.png
Fig. 22




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