A long straight wire carries a current of 35 A. What is the magnitude of the magnetic field B at a p

Question

A long straight wire carries a current of 35 A. What is the magnitude of the magnetic field B at a point 20 cm from the wire?

Professor PC Thomas Classes · Answer

$B = \frac{\mu_0 I}{2\pi r} = \frac{4\pi 	imes 10^{-7} 	imes 35}{2\pi 	imes 0.20} = 3.5 	imes 10^{-5}	ext{ T}$.