The formula for the magnetic field at a distance z along the axis of a loop of a current-bearing wire with loop radius R is the same as that for a magnetic dipole, provided A) z R. B) z = R. C) z

Question

The formula for the magnetic field at a distance z along the axis of a loop of a current-bearing wire with loop radius R is the same as that for a magnetic dipole, provided A) z >> R. B) z = R. C) z << R. D) Hold it! More than one of the previous responses is valid.

Quizplus · Accepted Answer

The formula for the magnetic field along the axis of a loop of a current-bearing wire approximates that of a magnetic dipole when the distance z from the loop is much greater than the radius R of the loop (z >> R). This condition allows for the simplification of the magnetic field equations to resemble those of a magnetic dipole.

The Formula for the Magnetic Field at a Distance Z