Final answer:
The magnitude of the magnetic field at point P is 2.86 × 10^-5 T.
Step-by-step explanation:
To determine the magnitude of the magnetic field at point P, we can use the formula for the magnetic field of a straight current-carrying wire:
B = (μ₀ * I) / (2π * r)
where B is the magnetic field, μ₀ is the permeability of free space (4π × 10-7 T*m/A), I is the current in the wire, and r is the distance from the wire to point P.
Using the given values, we can calculate:
B = (4π × 10-7 * 1.20) / (2π * 0.042) = 2.86 × 10-5 T