A) uniform over the whole cross-section
B) maximum onthe outer edge
C) maximum on the outer edge.
D) maximum at the centre of cross-section
Correct Answer: D
Solution :
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 \[B=\frac{{{\mu }_{0}}NI}{2\pi r}={{\mu }_{0}}nI,\] where \[n=\frac{N}{2\pi r}.\] Hence the magnitude of magnetic induction for a current carrying toroid of uniform cross-section is uniform over the whole cross-section.
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