At what distance from a long straight wire carrying a
currentof 5.0a is the magnitude of the magnetic field due to the
wireequal to the strength of the earth's magnetic field of about
5.0 x10^-5 t?

The distance is 2 cm

Solution:

According to the question:

Magnetic field of Earth, B_{E} =

Current, I = 5.0 A

We know that the formula of magnetic field is given by:

where

d = distance from current carrying wire

Now,

d = 0.02 m 2 cm

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

i would say