Physics Laws & Theorems
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Lenz's Law

Induced current opposes the change in flux that produced it.

Formula

ε∝−dΦBdt\varepsilon \propto -\frac{d\Phi_B}{dt}

Variables

\Phi_BMagnetic flux

Example

A magnet dropped through a copper tube falls slowly — induced currents oppose its motion.

Did You Know?

Lenz's law is nature's pushback — induced currents always oppose the change that created them.

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