Concerning two identical wires carrying the same current (same direction, speed

Question

Concerning two identical wires carrying the same current (same direction, speed and magnitude), they will be attracted because of the Ampere force. But when I was in the frame moving with the same speed as the electron in the current, why will there be the same force between each wire (supposing that the electrons are moving at a speed far less than c/10).

Also, when two bundles of electrons are moving in the vacuum at the same speed, will they be attracted because of the Ampere force? Will they be dis-attracted because of the Coulomb force?

Explanation / Answer

If you're in the frame where the electrons are standing still, the rest of the wires (which have an equal positive charge, since the total is neutral) are moving in the opposite direction, and provide the Ampere force.

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