Answer: Fleming's left-hand rule.
- A Fleming's left-hand rule
- B Ohm's circuit law
- C Lenz's induction law
- D Coulomb's force law
Correct answer: A. Fleming's left-hand rule
Explanation: Fleming's left-hand rule gives the direction of the motor 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.