How would a bar magnet orient itself to the magnetic field?

Answer. There is a magnetic pole in the earth and the magnetic pole of the earth runs via the equator and it has both the ends at the artic pole and the Antarctic pole. ... And that's how the bar magnet orient itself relative to this planet's magnetic field

Efficiency is an action of doing something. for example when you take a test. good efficiency means you did well but bad effeciency or no effiency means you did bad.