A) is non-zero and points in the z-direction by symmetry.
B) points along the axis of the toroid \[(\overrightarrow{M}=M\widehat{\phi })\]
C) is zero, otherwise there would be a field falling as \[\frac{1}{{{r}^{3}}}\] at large distances outside the toroid.
D) is pointing radially outwards.
Correct Answer: C
Solution :
(c) is zero, otherwise there would be a field falling as \[\frac{1}{{{r}^{3}}}\] at large distances outside the toroid. In a toroid magnetic field is only confined inside the body of toroid in the form of concentric magnetic lines of force and outside the toroid magnetic field is zero.
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