# 楞次定律演示 - Lenz's Law Demonstration

电磁感应与楞次定律的交互式演示

> 标准页面: https://elysiatools.com/zh/visualizations/lenz-law

- **分类:** Physics

## 概述

Interactive demonstration of Lenz's law and electromagnetic induction with a coil, movable bar magnet, and galvanometer. Features Faraday's law: ε = -N·dΦ/dt, magnetic flux: Φ = ∫B·dA = B·A·cos(θ), Ohm's law: I = ε/R, and Lenz's law: induced current opposes magnetic flux change. Real-time visualization includes: (1) Main canvas showing copper wire solenoid coil with adjustable turns N, movable bar magnet with north/south poles, magnetic field lines emanating from magnet, flux vectors showing direction and magnitude through coil, and current direction indicators (⊙ for out, ⊗ for in); (2) Galvanometer display with needle deflection showing current direction and magnitude, scale from -I to +I with zero center, and real-time current direction label; (3) Three real-time charts: Magnetic Flux vs Time (Φ), Induced EMF vs Time (ε), and Induced Current vs Time (I). Adjustable parameters: magnet speed (1-20 cm/s), coil turns N (10-500), resistance R (1-100 Ω), coil radius r (2-10 cm), magnet strength B₀ (10-100 mT), and animation speed (0.1-3.0x). Animation modes: Insert (magnet moves into coil), Extract (magnet moves out of coil), and Auto (continuous oscillation). Display options: show/hide magnetic field lines, current direction indicators, flux vectors, and coil details. Educational content covers magnetic flux concept, Faraday's induction law derivation, Lenz's law explanation with energy conservation, and practical applications: transformers, electric generators, induction motors, electromagnetic braking systems, metal detectors, and wireless charging. The visualization clearly demonstrates that inserting a magnet (increasing flux) induces current that creates opposing field, while extracting (decreasing flux) reverses current direction. Multi-language support (zh, en, es, fr, de, ru, pt).

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