Which one of the following expressions gives the magnitude of the magnetic field at a…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

Which one of the following expressions gives the magnitude of the magnetic field

B

at a perpendicular distance

r

from an infinitely long straight conductor carrying a steady current

I

? (a)

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

(b)

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

(c)

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

(d)

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