Current in a spring!
Imagine a spring is connected to a source of potential difference. What will happen to its length when the current flows through it?
We know that current creates magnetic field and the magnetic field applies force on current carrying wires. Therefore, if we have multiple current carrying wires in the space they will create magnetic field and apply force on each other.
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1 solution
It will compress and expand.
2 wires carrying currents in the same direction attract each other.
2 wires carrying currents in the opposite direction repel each other.
This is due to the Biot-Savart's Law .