Question

Explain the faraday experiment in detail.

Answer 1

Faraday law of electromagnetic induction

1. The absolute value or magnitude of the circulation of the electric field E around a closed loop, according to Faraday's law, is equal to the rate of change of the magnetic flux through the loop's enclosed region.
2. The first law of Faraday: An electromotive force is induced whenever a conductor is put in a changing magnetic field. A current is induced when the conductor circuit is closed, and this is known as induced current.
3. The second law of Faraday: The induced emf in a coil is equal to the rate of change flux.

$\begin{array}{l}\epsilon =-N\frac{\mathrm{\Delta }\varphi }{\mathrm{\Delta }t}\end{array}$

Where $\epsilon$ is the electromotive force, $\varphi$ is the magnetic flux, and $N$ is the number of turns.

Faraday's Experiment:

Construction:

1. The induction from a magnet passing through a coil is the subject of the experiment.
2. For the experiment, Faraday used a cardboard tube with insulated wire coiled around it to make a coil.
3. As a magnet was passed through the coil, a voltmeter was connected across it, and the induced EMF was measured.

Observation of experiment:

1. No voltage is observed when the magnet is at rest in or near the coil.
2. As the magnet approaches the coil, a voltage is measured, which rises to a peak as the magnet approaches the coil's center.
3. The voltage rapidly changes sign when the magnet travels through the center of the coil.
4. Voltage is measured in the opposite direction of the magnet's initial case moving into the coil when it moves out and away from the coil.

Result of the experiment:

1. A large magnetic field could be created by the fixed magnet.
2. If the flux across the coil is constant, no EMF can be generated.
3. The flux rapidly rises as the magnet approaches the coil until the magnet is inside the loop.
4. The magnetic flux through the coil begins to decrease as it goes through it. The produced EMF is gradually altered.