Answer: Ampere force.
- A Faraday effect
- B Ampere force
- C Lenz force
- D Coulomb force
Correct answer: B. Ampere force
Explanation: Ampere (or motor) force: F = BIL sin(theta). A current-carrying conductor in a magnetic field experiences this force.
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.