.Why is the following situation impossible? Imagine a copper wire with radius r = m encircling the Earth at its magnetic equator, where the field direction is horizontal. A power supply delivers p = W to the wire to maintain a current in it, in a direction such that the magnetic force from the Earth's magnetic field is upward. Due to this force, the wire is levitated immediately above the ground.
b( magnitude of earth's magnetic field) =
radius of earth =
density copper =
resistivity of copper =