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Faraday's experiments - Coggle Diagram
Faraday's experiments
Faraday's first experiment.
Faraday connected a loop of wire to an ammeter and moved a magnet through the loop:
Holding the magnet still results in the needle of the ammeter reading zero.
Pulling the magnet away from the loop results in the needle flickering in the opposite direction.
Since no battery is actually connected to the wire, the current must be generated, or inducted, by the variation of the magnetic field genrated by the magnet.
This type of current is called "induced current" and generates an "induced emf" (electromegnetic force).
Moving the magnet towards the loop results in the needle of the ammeter flickering in one direction.
Requirements:
A loop of wire
An ammeter
A magnet
Changes in the magnetic field create an induced current.
Faraday's second experiment.
Faraday used a sistem consisting of two circuits:
The first circuit consisted of a coil wrapped around an iron ring and connected to a battery.
When the current flows through the coil it produces a magnetic field, which is intensified by the iron ring.
The galvanometer registers this current and its needle briefly flickers, quickly returning to zero.
Opening the switch and stopping the flow of the current results in the needle flickering in the opposite direction.
A current impulse is generated in the second circuit only when the intensity of the current in the first circuit varies.
The iron ring is the same one.
The second circuit consisted of a coil wrapped around an iron ring and connected to a galvanometer.
Requirements:
Cooper wire
An iron ring
A battery
A galvanometer