The formula for calculating the magnetic field of two parallel wires is given by B = μ0I/2πd, where B is the magnetic field, μ0 is the permeability of free space, I is the current in the wires, and d is the distance between the wires.
The direction of the magnetic field is determined by the right-hand rule. Point your right thumb in the direction of the current in one wire, and your fingers will curl in the direction of the magnetic field.
Yes, the magnetic field of two wires can cancel each other out if the currents in the wires are flowing in opposite directions. This is known as a zero net magnetic field.
When the distance between the wires is increased, the magnetic field decreases. This is because the magnetic field is inversely proportional to the distance between the wires.
The strength of the magnetic field is directly proportional to the current in the wires. This means that if the current increases, the magnetic field also increases.