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Two parallel wires carrying currents in OPPOSITE directions:
AAttract each other
BREPEL each other
CNo force
DTwist apart
Answer & Solution
Correct answer: B. REPEL each other
Same direction = attract (parallel currents try to merge); opposite direction = repel. Define of ampere (1948 definition) used this force: 1 A is the current that produces 2 × 10⁻⁷ N/m force between two parallel wires 1 m apart.
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