Q150 / 170 · Manipal (MET) 2020 · Physics

The formula for magnetic field of a certain component is given by $B=\frac{\mu_0 N i}{2 \pi r}$ where, $N=$ total number of turns $i=$ current through it $r=$ radius. The component is

  • A
    ring
  • B
    solenoid
  • Correct answer
    C
    toroid
  • D
    None of these

Solution

Magnetic field at the centre of a toroid is given by $B=\frac{\mu_0 N i}{2 \pi r}$ where, $n=\frac{N}{2 \pi r}=$ number of turns per unit length of the toroid.

Hence, the correct answer is option: 'C'.

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