FIGURE 22-9
-A long straight wire carrying a 4-A current is placed along the x-axis as shown in Figure 22-9. What is the magnitude of the magnetic field at a point P, located at y = 0.02 m, due to the current in this wire?

Question

FIGURE 22-9 
-A long straight wire carrying a 4-A current is placed along the x-axis as shown in Figure 22-9. What is the magnitude of the magnetic field at a point P, located at y = 0.02 m, due to the current in this wire?

Quizplus · Accepted Answer

The magnetic field due to a long straight wire is given by B = (μ₀I)/(2πr), where μ₀ = 4π x 10⁻⁷ Tm/A, I = 4 A, and r = 0.02 m. Substituting these values gives B = (4π x 10⁻⁷ Tm/A x 4 A)/(2π x 0.02 m) = 40 μT.

FIGURE 22-9 -A Long Straight Wire Carrying a 4-A Current Is Placed