Q144 / 160 · AP EAMCET 2010 · Physics

The intensity of the magnetic induction field at the centre of a single turn circular coil of radius $5 \mathrm{~cm}$ carrying current of $0.9 \mathrm{~A}$.

  • Correct answer
    A
    $36 \pi \times 10^{-7} \mathrm{~T}$
  • B
    $9 \pi \times 10^{-7} \mathrm{~T}$
  • C
    $36 \pi \times 10^{-6} \mathrm{~T}$
  • D
    $9 \pi \times 10^{-6} \mathrm{~T}$

Solution

The intensity of magnetic induction field $B=\frac{\mu_0 i}{2 r}$ $=\frac{4 \pi \times 10^{-7} \times 0.9}{2 \times 5 \times 10^{-2}}$ $B=36 \pi \times 10^{-7} \mathrm{~T}$

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

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