How does a current carrying wire differ from a wire without carrying current?

If the distance between two parallel current carrying wire is doubled. What is the force between them?

What is the conventional direction of current? How does it differ from the actual motion of charge carrier inside a current-carrying conductor?

How does the magnetic field at the centre of a current carrying circular coil change, when current is doubled and its radius is halved?

How does metaphase I differ from metaphase?

Is a current carrying conductor electrically charged?

An infinitely long straight current carrying wire produces a magnetic field B at a point at a distance 'a' from it. What must be the radius of the circular loop, so that for the same current through it the magnetic field at (II) an axial point, distant equal to the radius of the loop equals B?