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  1. Electromagnetism
  2. Introduction to Electromagnetism
  3. Using Lenz's Law to Find Direction of Induced Current
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Introduction to Electromagnetism
Electromagnetic Induction
Magnetic Flux and Faraday's Law of Electromagnetic Induction
Magnetic Flux and Faraday's Law Example
Lenz's Law
Lenz's Law Examples
Using Lenz's Law to Find Direction of Induced Current
Magnetic Flux and Induced Current Example
Motional emf
Motional emf Example # 1
Motional emf Example # 2
Electromagentic Blood Flow Meter and Motional emf
Electric Generators
Electric Generator Example
Counter Torque in Electric Generators
Eddy Currents
Transofmers and Transfomers Equation
Transformers Equation Example
Power Transmision and Transformers Example
Changing Magnetix Flux Produces Electric Field
Self and Mutual Inductance
LR Circuits, LC Circuits and LCR Circuits
Electromagnetic Waves and Maxwell's Equations

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Using Lenz's Law to Find Direction of Induced Current

Content Provider AK Lectures
Description Lenz's Law can be a somewhat confusing law primarily because it involves two different magnetic fields. Let us first make a distinction between these two fields. An external magnetic field induces an emf inside a closed conducting loop of wire, which in turn produces an induced electric current that flows within that wire. This current then produces its own induced magnetic field. Therefore, the two magnetic fields are the (1) original external magnetic field that produces the induced current and (2) the induced magnetic field created by the induced current moving through the conducting wire. Using Lenz's Law involves these two magnetic fields but in order to use it, two conditions must exist: we must have a (1) closed conducting loop of wire and (2) a changing magnetic flux. If these two conditions are satisfied, then the following three steps must be followed in order to determine the direction of the induced current. First, you must determine whether the magnetic flux is increasing or decreasing. If the magnetic flux is increasing, then that implies the induced magnetic field points in the opposite direction of external magnetic field. On the other hand, if the magnetic flux is decreasing, the two fields will point in the same direction. Finally, we apply the right hand rule (#1) to determine the direction of the induced current. We curl our hands around the wire in the same direction as the induced magnetic field and extend the thumb so that it points in the same direction as the induced current.
Language English
Access Restriction Open
Subject Keyword Classical Physics hands law distinction flows steps direction emf
Content Type Video
Educational Role Teacher Student
Educational Use Self Learning Lecture Reading
Resource Type Video Lecture
Education Level Under Graduate
Subject Electricity & electronics
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