Question

The flux density in air at a point of 9 cm from the long straight wire carrying a current of 6A is given by $x\times {10}^{-7}$. Find the value of 'x'

Answer 1

Given, $a=9cm=9\times {10}^{-2}m,I=6A$
$B=\frac{{\mu }_{o}I}{2\pi a}=\frac{4\pi \times {10}^{-7}\times 6}{2\pi \times 9\times {10}^{-2}}=1.33\times {10}^{-5}T$