Motional EMF (ε = BLv)
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
Learning zone
Drag a wire sideways through a magnetic field and the magnetic force herds its free electrons toward one end — a battery made of motion. It is Faraday's law in its simplest costume: the moving wire sweeps out BLv of flux per second. An airliner with a 60 m wingspan crossing Earth's 50 μT vertical field at 250 m/s develops 0.75 V wingtip-to-wingtip. Scaled up with strong fields and fast coils, this is precisely how every generator turns motion into electricity.
Motional EMF (ε = BLv)
Where
- = Motional EMF
- = Magnetic field
- = Conductor length
- = Speed
Missing one of these? Work it out first, then come back
- Motional EMF — Faraday's Law of Induction, Ohm's Law
- Magnetic field — Magnetic Flux (Φ = BA cos θ), Magnetic Field of a Solenoid
- Conductor length — Magnetic Field of a Solenoid, Resistance of a Wire (R = ρL/A)
- Speed — Speed, Distance & Time, Kinetic Energy