Question

The formula for magnetic field of a certain component is given by
$B=\frac{{\mu }_{0}Ni}{2\pi r}$, where, $N=$ total number of turns
$i=$ current through it
$r=$ radius.
The component is

• A. ring
• B. solenoid
• C. toroid
• D. None of these

Answer 1

Answer: (C)

Magnetic field at the centre of a toroid is given by $B=\frac{{\mu }_{0}Ni}{2\pi r}$
where, $n=\frac{N}{2\pi r}=$ number of turns per unit length of the toroid.