# Doubt in magnetics

Two current carrying wires kept at a distance will repel each other if they have currents in opposite directions. In the case of a current carrying square loop, would two opposite sides also repel each other? I think there would be a repulsive force which would cause a strain in the other two wires. Can somebody rectify this?

• oooooeeeeee thats a good question, but if you have just a loop of wire with a power supply, you will end up with a short circuit, which should cut it out, removing any potential repulsive effect – Alex Robinson Feb 5 '17 at 17:22

An alternative way to think about this is in terms of the magnetic pressure. The current produces a magnetic field passing through the loop and this in turn is responsible for a magnetic pressure $B^2/2\mu_0$ (in SI units and which is equivalent to the energy density of the magnetic field).