Question

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

• A. $36 \pi \times 10^{-7} T$
• B. $9 \pi \times 10^{-7} T$
• C. $36 \pi \times 10^{-6} T$
• D. $9 \pi \times 10^{-6} T$

Answer 1

Answer: (A)

The intensity of magnetic induction field
$B =\frac{\mu_{0} i}{2 r}$
$=\frac{4 \pi \times 10^{-7} \times 0.9}{2 \times 5 \times 10^{-2}}$
$B =36 \pi \times 10^{-7} T$