Question

Given a straight wire with a 1A current flowing on it. Calculate the magnetic field magnitude at a distance of 3mm from the

wire.

Answer 1

magnetic field;

$B=\frac{\mu_o I}{2\pi d}$

$\mu_o=4\pi \times 10^{-7}, I =1A, d=3mm=3\times 10^{-3}m$

$B=\frac{4\pi \times 10^{-7}\times 1}{2\pi \times3\times 10^{-3}}=6.67\times 10^{-5}T$