EMI Full Form in Physics

What is the full form of EMI in Physics?

The full form of EMI is “Electro-Magnetic Induction”. EMI is a current produced due to a change in a magnetic field. This happens when two current-carry conductors are placed and the flow of current produces a stationary magnetic field.

Michael Faraday performed an experiment in which he arranged a current-carrying wire attached to the device that voltmeter measures the voltage of current across the circuit. Through this experiment, he observed certain factors that influence the voltage. These are

1. A number of coils – The voltage is directly proportional to the number of coils; the greater the turns, the greater the voltage is produced.

2. Changing the magnetic field – The magnetic field affects the induced voltage. This can be done when either the magnetic field is moving or the conductor is moving in the magnetic field.

Applications of Electromagnetic Induction.

The application is based on Faraday's Law that the amount of voltage induced in a coil is proportional to the number of turns of the coil and the rate of changing magnetic field.

• The AC generator works on the principle of EMI.

• The working of electrical transformers is based on the principles of EMI.

• The magnetic Flow Meter is based on the EMI.

Formulae of Electromagnetic Induction

\begin{equation}

\mathbf{e}=\mathbf{N} \times \mathbf{d} \boldsymbol{\Phi} / \mathbf{d t}

\end{equation}

Where :

e = the induced voltage

N = the number of turns in the coils

= The magnetic flux

T = Time (in seconds)