Lenz's Law Calculator
Compute induced EMF and current ε = −N·ΔΦ/Δt.
Input Data
Number Of Turns
turns
Initial Flux Wb
Wb
Final Flux Wb
Wb
Time S
s
Resistance Ohm
Ω
Results
ε = −NΔΦ/Δt.
-0.1V
I = ε/R.
0.1A
Φ₂ − Φ₁.
0.01Wb
ΔΦ/Δt.
0.1Wb/s
At a glance:ε = −N·ΔΦ/Δt; I = ε/R. The minus sign (Lenz) opposes the change. Complements faraday-law and back-emf.
Formula
ε = −N·(ΔΦ/Δt).
$$\varepsilon = -N\frac{d\Phi}{dt}, \quad I = \frac{|\varepsilon|}{R}, \quad \Delta\Phi = \Phi_2 - \Phi_1$$How to Use
- Enter N, flux change and time (and R).
- The tool returns EMF and current.
Case Studies
N=100, ΔΦ=0.01, Δt=0.1, R=10
ε=−10 V, I=−1 A.
FAQ
Sign meaning?
Negative sign means the induced current opposes the flux change.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.