Answer: Attract each other.
- A Repel each other
- B Attract each other
- C Have no force between them
- D Repel at close range, attract far
Correct answer: B. Attract each other
Explanation: Parallel currents in same direction attract (like charges repel but like currents attract). This is due to Ampere's force law.
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.