Question

Calculate the magnetic induction at a point $10cm$ from a long straight wire placed in air carrying a current of $10A$.

Answer 1

Given data:
$a=10cm=10\times {10}^{-2}m$; $I=10A$; $B=$?
Solution:
Magnetic Induction at a point due to a long straight wire.
$B=\frac{{\mu }_{0}I}{2\pi a}=\frac{4\pi \times {10}^{-7}\times 10}{2\pi \times 10\times {10}^{-2}}$
$B=2\times {10}^{-5}T$