*Neumann Law*"

*Lenz's law*". The direction of induced EMF is described by Fleming's right-hand rule.

Skip to content
## (The Advance Learning Institute of Physics and Technology)

###
Faraday's laws of electromagnetic induction

## Popular Posts

## Categories

## Blog Archive

Faraday's Laws of Electromagnetic Induction:

The Faraday's experiment shows the two laws which are known as Farday's laws of electromagnetic induction

First Law (Neumann's Law): The rate of change of magnetic flux through a circuit is equal to the emf produced in the circuit. This is also known as "*Neumann Law*"

$e=-\frac{\Delta \phi}{ \Delta t}$

Here negative sign shows the direction of emf.

If $\Delta t \rightarrow 0$

$e=-\frac{d \phi}{ d t}$

This equation represents an independent experimental law that cannot be derived from other experimental laws.

If the circuit is a tightly wound coil of $N$ turns, then the induced emf

$e=-N\frac{d \phi}{ d t}$

$e=-\frac{d \left(N \phi\right)}{ dt}$

Here $N \phi$ is called the 'Linkage magnetic flux'.

Note: The change in flux induces emf, not the current.

Second Law (Lenz's Law): The direction of induced EMF produced in a closed circuit is such that it opposes the original cause that produces it. It is also called "*Lenz's law*". The direction of induced EMF is described by Fleming's right-hand rule.

- Alternating Current Circuits
- Atomic and Molecular Physics
- Capacitors
- Control System
- Current carrying loop in magnetic field
- Current Electricity
- Electromagnetic Induction
- Electromagnetic Wave Theory
- Electrostatic
- Gravitation
- Laser System & Application
- Magnetic Effect of Current
- Magnetic Substances
- Magnetism
- Nanoscience & Nanotechnology
- Newtonian Mechanics
- Nuclear Physics
- Numerical Problems and Solutions
- Optical Fiber
- Properties of Matter
- Quantum Mechanics
- Ray Optics
- Relativity
- Semiconductors
- Topic wise MCQ
- Waves