Toroid
Category : JEE Main & Advanced
A toroid can be considered as a ring shaped closed solenoid. Hence it is like an endless cylindrical solenoid.
Consider a toroid having n turns per unit length. Magnetic field at a point P in the figure is given as
\[B=\frac{{{\mu }_{0}}Ni}{2\pi r}={{\mu }_{o}}ni\] where \[n=\frac{N}{2\pi r}\]
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