Истории и востоковедения
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- Бұл бет үшін навигация:
- Faradays First Law
- Faradays Second Law
| Position of magnet
Deflection in galvanometer Magnet at rest No deflection in galvanometer Magnet moves towards the coil Deflection in galvanometer in one direction Magnet is held stationary at same No deflection in galvanometer position (near the coil) Magnet moves away from the coil Deflection in galvanometer but in opposite direction Magnet is held stationary at same No deflection in galvanometer position (away from the coil) From this experiment, Faraday concluded that whenever there is relative motion between conductor and a magnetic field, the flux linkage with a coil changes and this change in flux induces a voltage across a coil. Michael Faraday formulated two laws on the basis of above experiments. These laws are called Faraday's laws of electromagnetic induction. Faraday's First Law Any change in the magnetic field of a coil of wire will cause an emf to be induced in the coil. This emf induced is called induced emf and if the conductor circuit is closed, the current will also circulate through the circuit and this current is called induced current. Methods to change magnetic field: 1. By moving a magnet towards or away from the coil 2. By moving the coil into or out of the magnetic field. 3. By changing the area of a coil placed in the magnetic field 4. By rotating the coil relative to the magnet. 79 Faraday's Second Law It states that the magnitude of emf induced in the coil is equal to the rate of change of flux that linkages with the coil. The flux linkage of the coil is the product of number of turns in the coil and flux associated with the coil. Methods to increase emf induced in a coil: 1. By increasing the number of turns in the coil. 2. By increasing magnetic field strength. 3. By increasing the speed of the relative motion between the coil and the magnet. жүктеу/скачать 1,14 Mb. Достарыңызбен бөлісу:
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