Question

Find the magnetic field at a distance 3m from a long, straight wire carrying a

      current of 2 A.

Answer 1

Solution;

Given;

I=2A

x=3m

Take;

$\mu_0=4π×10^{-7}Wb/Am$

Then;

$B=\frac{\mu_0 I}{2πx}=\frac{4π×10^{-7}×2}{2π×3}=1.333×10^{-7}T$