Answer: attract each other.
- A attract each other
- B repel one another
- C never interact at all
- D spin rapidly
Correct answer: A. attract each other
Explanation: Parallel currents attract; antiparallel currents repel.
The magnetic field around a long straight current-carrying wire forms concentric circles, with direction given by the right-hand rule (point thumb along I, fingers curl in the direction of B).
Concept context
Magnetic force on moving charges and currents, the Biot-Savart law, Ampere's law, and the cyclotron - how electric currents create and respond to magnetic fields.