Question

two wires carrying current in same direction attract each other but two beams of electron travelling in the same direction repel each other why ​

Answer 1

Two proton beams going in same direction repel each other whereas two wires carrying currents in the same direction attract each other. ... In the case of wires the net charges in two wires are zero everywhere along the wires. That makes the net electrical forces between the wires very nearly zero.

Answer 2

the two wires carrying current in the same direction attract each other due to magnetic interaction net charge on the current carrying wire is zero and hence there is no electricity connection between the wire

in case of two beams of electron electrostatic interaction is much more than the magnetic interaction hence two beams of electrons repel each other