At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10^-⁵ T? A)1.0 cm B)2.0 cm C)3.0 cm D)4.0 cm E)5.0 cm

Question

Quizplus · Accepted Answer

The magnetic field due to a long straight wire is given by B = (μ₀I)/(2πr). Setting this equal to 5.0 × 10⁻⁵ T and solving for r with I = 5.0 A gives r ≈ 2.0 cm.

At What Distance from a Long Straight Wire Carrying a Current