How far from the center of a wire carrying a 2.0 A current does the magnetic field that results from the current have a magnitude of 4.0 × 10^-5 T? A)1.0 mm B)0.5 mm C)0.16 mm D)13 mm

Question

Quizplus · Accepted Answer

The magnetic field B around a long straight wire is given by B = (μ₀I)/(2πr), where μ₀ is the permeability of free space (4π × 10⁻⁷ T·m/A), I is the current, and r is the distance from the wire. Solving for r with B = 4.0 × 10⁻⁵ T and I = 2.0 A gives r = 1.0 mm.

How Far from the Center of a Wire Carrying a 2.0