/ Preparation Physics Electromagnetic Induction
Let us now learn about faraday's law of induction since it is a favourite among the teachers who set the question paper for JEE MAINS. There was a belief that electricity and magnetic fields are two completely different principles and cannot be used interchangeably. But Michael Faraday not only just proved this belief wrong but was also able to define how change in the magnetic field could lead to the flow of electric current in a conductor. let us explore some more details about this principle through the article given below.
- What is Faraday’s Law of Induction
- Faradays First Law of Electromagnetic Induction
- Faradays Second Law of Electromagnetic Induction
- Lenz Law: Additional to Faraday
- Real-World Uses
- Physics Class 12 NCERT Solutions
What is Faraday’s Law of Induction
According to this principle, a change in the magnetic field B is necessary for the flow of electric current through the conductor. The main aim of this principle was to establish how magnetic field and electric field are related to each other and if combined, can be to generate electricity. Faraday proposed two laws to define the fundamental concept of electromagnetic induction, which are necessary to study the properties of electric field and magnetic field and their properties are used in the designing of electric devices such as generators, transformers, motors, inductors, etc.
To learn more details about these laws, keep scrolling further.
Faradays First Law of Electromagnetic Induction
This law states that a change in the magnetic field can induce EMF or voltage in the circuit. The change in magnetic flux can be caused by moving the magnet or the coil. Magnetic flux is defined as the total magnetic field passing through the circuit and is generally represented by:
ΦB=∫B⋅dA
Where,
B= magnetic field
dA= area vector
Faradays Second Law of Electromagnetic Induction
This law states that magnitude of the induced EMF will be directly proportional to the negative rate of change of magnetic flux through the circuit. This negative signed can be explained by the Lenz Law, which is mentioned in the article later on.
Mathematical Representation:
EMF=−dϕB/dt
Where,
Θ = angle between magnetic field and the normal
dϕB = rate of change of magnetic flux
Lenz Law: Additional to Faraday
Lenz law explains the negative sign in the Faraday second law of induction and is used to define the direction of induced current. This law mainly opposes the change behind the induction. It ensures to follow the principle of conservation of energy and makes sure that the direction of induced current always stays opposite to the magnetic flux.
EMF=−dϕB/dt
The negative sign in this equation (faraday second law) is used in reference to the Lenz Law, where it indicates the direction of the induced current.
Real-World Uses
The principles used in Faraday laws are is used in designing of various electric devices which allow the advancement on the technologies used in the modern world. Some of these applications are mentioned as follows:
- Generators
- Motors
- Transformers
- Electric Meters
- Wind Turbines
- Hydro Power Plants
- Automobiles
Physics Class 12 NCERT Solutions
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Commonly asked questions
What is the core difference between Faraday law and Lenz's law?
Why does faraday first law not have any formula?
Why did faraday use two separate laws to explain his concept and didn't just combine both of these into a single statement?
Physics Electromagnetic Induction Exam
Student Forum
Anything you would want to ask experts?Other Topics under this Chapter
- Potential Energy of a System of Charges
- Lenz's Law and Conservation of Energy
- Inductance
- AC Generator
- Magnetic Flux
- Faraday Law of Induction
- Experiments of Faraday and Henry
- Motional Electromotive Force
- Combination of Capacitors
- Parallel Plate Capacitor
- Electrostatics of Conductors
- Electromagnetism
- Torque on current loop, magnetic loop dipole
- Moving Coil Galvanometer
- Force between two parallel currents, the Ampere
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