If an electric wire is allowed to produce a magnetic field no larger than that of the earth (0.503 x 104 t) at a distance of 15 cm from the wire, what is the maximum current the wire can carry?

37.725 A

Explanation:

B = magnitude of the magnetic field produced by the electric wire = 0.503 x 10⁻⁴ T

r = distance from the wire where the magnetic field is noted = 15 cm = 0.15 m

i = magnitude of current flowing through the wire = ?

Magnetic field by a long wire is given as

Inserting the values

i = 37.725 A

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