Lenz's Law and Magnetic Flux

1. With this definition of the flux being , we can now replica to Faradays investigations. He found that the magnitude of the emf take ind depends on the pasture at which the attractive forceic flux neuters. Faraday found that if the flux with N loops of wire changes by an amount , during a quantify delta t, the average generate emf during this time is

This fundamental resultant is known as Faradays law of induction.

The minus sign is place there to remind us in which direction the induced emf acts. Experiment shows that an induced emf always gives set up to a current whose charismatic field rebuts the authentic change in flux. This is known a Lenzs law. Let us get into it to the case of relative motion between a magnet and a coil. The changing flux induces an emf, which produces a current in the coil; and this induced current produces its own magnet field. If the duration between the coil and the magnet decreases; so the magnetic field, and and then the flux, through the coil increases. The magnetic field of the magnet points upward. To oppose this upward increase, the field produced by the induced current mustiness point downward. Thus Lenzs law tells us that the current must move by the use of the use of the right hap rule.



If the flux decreases, so the induced current produces an upward magnetic field that is trying to maintain the status quo.

Let us consider what would give-up the ghost if Lenzs law were just the reverse. The induced current would produce a flux in the same direction as the original change; this greater change in flux would produce an even big current, followed by a still larger change in flux, and so on. The current would continue to bristle indefinitely, producing...

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