# Electronics Engineering

## Force in a Magnetic Field

Force in a Magnetic Field: Force in a Magnetic Field – If a conductor of length l metres carrying current I amperes is placed in a magnetic field of intensity B (tesla), and if B is perpendicular to I, the force acting on the conductor is If N electrons are contained in a length l …

## Two Dimensional Motion in a Uniform Electric Field

Two Dimensional Motion in a Uniform Electric Field: Two Dimensional Motion in a Uniform Electric Field – Let us consider that an electron enters the region between two parallel plates of a parallel plate capacitor oriented as illustrated in Fig. 3.5 with an initial velocity vox m/s in the +X direction. It is assumed that …

## What is Current Density?

What is Current Density? By definition, the current density, denoted by the symbol J, is the current per unit area of the conducting medium i.e., where current I is the rate of flow of charge. If N is the free electron density moving in the conducting medium, e is the charge of electron, then the …

## What is Electron Volt?

What is Electron Volt? The joule (J) is the unit of energy in the SI system. In some engineering power problems this unit is very small, and a factor of 103 or 106 is introduced to convert from watts (1 W = 1 J/s) to kilowatts or megawatts, respectively. For a discussion of the energies …

## Motion of Charged Particle in Electric Field

Motion of Charged Particle in Electric Field: Motion of Charged Particle in Electric Field – The electric field intensity which is equal to negative of the voltage gradient, is defined as the force (in newtons) acting per unit positive charge (in coulomb), and has the same direction as that of the force. Consequently, the force …

## Rutherford Nuclear Model of Atomic Structure

Rutherford Nuclear Model of Atomic Structure: In order to explain many phenomena associated with conduction in gases, metals and semiconductors and the electron emission from a metal surface, it is necessary to assume that the atom has loosely bound electrons which can be torn away from it. On the basis of experiments on the scattering …

## Single Mesh and Multi Mesh Network

Single Mesh and Multi Mesh Network: Electric network may provide a single closed path (known as a mesh or loop) or several closed paths for the flow of current. An elementary single mesh network, in which all the elements carry the same current, is shown in Fig. 2.1. An elementary multi mesh network is shown …

## Zero Reference Level in Electronics Engineering

Zero Reference Level in Electronics Engineering: Zero Reference Level – In order to avoid errors in the measurement of different voltages in an electronic circuit, it is imperative to select some common point, known as reference, zero potential or datum point and measure all circuit voltages (whether positive or negative) with respect to this point. …

## What is Capacitor in Electronics?

What is Capacitor in Electronics?: What is Capacitor in Electronics? – Capacitor is a two-terminal element that has the capability of charge storage and, consequently, energy storage. The stored energy can be fully retrieved. The current through the capacitor is proportional to the derivative of voltage across it and is given by expression where C …

## What is Inductor in Electronics?

What is Inductor in Electronics?: An inductor has been defined as a physical device which is capable of storing energy by virtue of a current flowing through it. An Inductor in Electronics is a circuit component which opposes the change of current flowing through it and induces a voltage when the current flowing through it …