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Two straight parallel wires carrying current in the opposite directions repe each other, because of

1. Electrical force between them
2. Magnetic force between them
3. Gravitational force between them
4. Nuclear force between them

Correct answer: Magnetic force between them

Solution

Each wire produces a magnetic field that acts on the moving charges in the other wire. For opposite current directions, the magnetic interaction is repulsive, so the wires push apart due to magnetic force.

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