Q: A metallic coil that consists of 200 ( N ) turns encloses an area ( A ) of 100 cm2. The coil is placed within a magnetic field ( B ) that is perpendicular to its area, and it has a magnetic flux density of 0.50 T. Next, the field is shut off, andContinue reading “MAGNETISM AND ELECTROMAGNETISM: Electromagnetic Induction and the Electromotive Force ( emf )”
Tag Archives: magnetic flux
MAGNETISM AND ELECTROMAGNETISM: Magnetism, Electromagnetic Induction, Lenz’s Law, and the Right-Hand Rule
Early experiments with magnetism revealed that a current-carrying wire is surrounded by circular lines of magnetic flux ( ɸ ). The orientation of this field could be predicted via usage of the Right-Hand Rule. These observations are indeed interesting, and they were made when the current ( I ) passing through a conductor was constant;Continue reading “MAGNETISM AND ELECTROMAGNETISM: Magnetism, Electromagnetic Induction, Lenz’s Law, and the Right-Hand Rule”
INTRODUCTION TO ELECTRONICS: Magnetism and the Magnetic Field
The concept of “ free space “ may be visually appealing to the senses, but this perception very rarely ( if ever ) describes any meaningful description of any region of space. This argument can easily be confirmed with objects as simple as paper clips and refrigerator magnets. Under the right conditions, seemingly magical forcesContinue reading “INTRODUCTION TO ELECTRONICS: Magnetism and the Magnetic Field“
INTRODUCTION TO ELECTRONICS: DC Motors
We have seen how a conducting wire moving with respect to an electric field ( B ) will experience forces upon its electrons. Consider the diagram below: Due to the proper ( perpendicular ) alignment of the loop and magnetic field, the maximum amount of DC current will be produced; however the voltages and currentsContinue reading “INTRODUCTION TO ELECTRONICS: DC Motors”
INTRODUCTION TO ELECTRONICS: DC Generator Fundamentals
In order to understand how DC generators produce electricity, it is crucial to understand how the relative motion of a conductor moving through a magnetic field ( B ) induces forces that put the conductor’s electrons into motion; however, prior to engaging in a discussion about electromagnetic induction, we must briefly re-examine how the magneticContinue reading “INTRODUCTION TO ELECTRONICS: DC Generator Fundamentals”
INTRODUCTION TO ELECTRONICS: Magnetic Field Intensity and Hysteresis
Please recall that the magnetomotive force ( Fm ) equation shows how the magnitude of current ( I ) flowing through ( N ) loops of wire determine how much flux ( ɸ ) is established within a metal core around which the wire is wrapped: Fm = NI It is important to remember thatContinue reading “INTRODUCTION TO ELECTRONICS: Magnetic Field Intensity and Hysteresis”
INTRODUCTION TO ELECTRONICS: Electromagnet Fundamentals
Thus far, we’ve seen how charge ( q ) in motion has the ability to give rise to magnetic fields ( B ) within certain material types. It will now be useful to see how certain rules are used to determine which direction this magnetic flux ( ɸ ) will travel within a given magneticContinue reading “INTRODUCTION TO ELECTRONICS: Electromagnet Fundamentals”
INTRODUCTION TO ELECTRONICS: The Magnetomotive Force
The relationship between cause, effect, and resistance ( R ) to change are beautifully summed up by the Ohm’s law equation: ( V / R ) = I The greater the ability a system has to resist change, the less so that change will be observed. As far as Ohm’s law is concerned, change isContinue reading “INTRODUCTION TO ELECTRONICS: The Magnetomotive Force”
INTRODUCTION TO ELECTRONICS: Reluctance and Permeability of Magnetic Materials
Q: A blacksmith splits open a doughnut-shaped torus as pictured below: The inner radius of the torus is 1.75 cm, and the outside radius is 2.25 cm. If the torus is made of low-carbon steel, what is its reluctance? A: Let’s begin by viewing the torus from above prior to being split apart: The threeContinue reading “INTRODUCTION TO ELECTRONICS: Reluctance and Permeability of Magnetic Materials”
INTRODUCTION TO ELECTRONICS: Permeability and Reluctance of Magnetic Materials
Many uncanny comparisons can be made between the behavior of electric currents and magnetic flux ( ϕ ) within conductive materials. In the same way that some materials conduct current better than others, metallic materials differentially provide pathways through which magnetic flux can permeate. The permeability ( μ ) of any material is relative toContinue reading “INTRODUCTION TO ELECTRONICS: Permeability and Reluctance of Magnetic Materials”
RENAISSANCE PHYSICS 