Physics

Problem

State the expression for the magnitude of the magnetic field

B

at a perpendicular distance

r

from a long, straight conductor carrying current

I

in free space. a)

B=\dfrac{\mu_0 I}{\pi r}

B=\dfrac{\mu_0 I}{2\pi r}

B=\dfrac{\mu_0 I}{4\pi r}

B=\dfrac{\mu_0 I}{2 r}