Difference between revisions of "Lenz's Law"
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| − | '''Lenz's Law''' is a law which was published in 1833 by | + | '''Lenz's Law''' is a law which was published in 1833 by Emil Lenz. It determines the direction of the electric [[current]] in electromagnetic [[Principle of induction|induction]]. The law says: |
| + | {{Cquote|The induced current is always directed such that it always acts contrary to its cause.}} | ||
| + | It is necessary for there to be [[conservation of Energy|conservation of energy]]. It comes from the fact that the induced current produces a [[magnetic field]] in addition to the one that caused the induced current. Faraday's law describes induction mathematically relating the [[voltage]] induced, V, to the magnetic flux, Φ<sub>B</sub> , as: | ||
| + | |||
| + | <math> | ||
| + | V = \frac{d \phi_B}{dt} | ||
| + | </math> | ||
| + | |||
| + | The minus sign represents Lenz's law, that the induced voltage (and therefore current that might flow) will oppose the flux that is causing it. | ||
| − | + | ==See Also== | |
| + | * [[Gauss's Law|Gauss's law]] | ||
| + | * [[Ampere's law]] | ||
| + | [[Category:Physics]] | ||
[[Category:Electromagnetism]] | [[Category:Electromagnetism]] | ||
Revision as of 16:39, April 15, 2017
Lenz's Law is a law which was published in 1833 by Emil Lenz. It determines the direction of the electric current in electromagnetic induction. The law says:
| “ | The induced current is always directed such that it always acts contrary to its cause. | ” |
It is necessary for there to be conservation of energy. It comes from the fact that the induced current produces a magnetic field in addition to the one that caused the induced current. Faraday's law describes induction mathematically relating the voltage induced, V, to the magnetic flux, ΦB , as:
<math> V = \frac{d \phi_B}{dt} </math>
The minus sign represents Lenz's law, that the induced voltage (and therefore current that might flow) will oppose the flux that is causing it.