electromagnetic induction (电磁感应) Lenz's law(楞次定律) An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic field that induces the current electromagnetic induction （电磁感应） S N Lenz’s law（楞次定律） An induced current has a direction such that the magnetic field due to the current opposes the change in the magnetic field that induces the current