Question

Find magnetic field at centre P if length of side of square loop is 20 cm.

• A. 12$\sqrt{2}$ × 10^-6T
• B. 12 × 10^-6T
• C. 6 × 10^-6T
• D. 6$\sqrt{2}$ × 10^-6T

Answer 1

Answer: (A)

$B=\frac{{\mu }_{0}i}{\pi 9}2\sqrt{2}$
$=\frac{4\pi \times 10^{-7}\times 3}{\pi \times 0.2}$
$=120\sqrt{2}\times 10^{-7}$
$B=12\sqrt{2}\times 10^{-6}T$