If two parallel conducting wires carry current in the same direction, then they

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

Two long straight thin conductors carrying currents I_1 and I_2 respectively along the same direction are placed parallel to each other in air. Derive an expression for the force per unit length acting on any one of the conductors and hence define one ampere current.

Two adjacent conductors are carrying the same positive charge. Can there be a potential difference between them ?

Show that when two progressive waves travelling in the same direction superimpose,the resultant was is also a progressive wave.

A long straight wire carries a current of 10 ampere. An electron travels with a velocity of 5.0x10 ms parallel to the wire at 0.1 m from it and in a direction opposite to the current. What force is exerted on the electron ?.

When two charged conductors are connected by a conducting wire, then charge will not flow if the conductors are of