Consider a metal wire of length 2m and cross sectional area 2.5E-4 m2, connected to a +/-5V, 120Hz AC power supply. Calculate the magnetic field strength, B, at a distance 2 cm from the wire after 10 seconds. Give your answer to two decimal places.
Resistivity of the wire = 8.5E-8 Ωm.
μ, (permeability of freespace) = 1.26E-6 A/m2.