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Magnetic Fields

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...

Induced Electric Fields

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...

Induced Electric Fields: Applications

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...

Induction

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...

Magnetic Field Due To A Thin Straight Wire

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.

Magnetic Field Due to Two Straight Wires

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Related Experiment Video

Updated: Jul 20, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

A technical note about Phidel: a new software for evaluating magnetic induction field generated by power lines.

M Comelli¹, M Benes, A Bampo

¹Regional Environment Protection Agency of Friuli Venezia Giulia (ARPA FVG), Environmental Physics, Via Tavagnacco 91, 33100 Udine, Italy. comelli@phidel.it

Radiation Protection Dosimetry

|August 29, 2006

Summary

A new software, Phidel, accurately calculates magnetic induction fields from power lines, overcoming limitations of existing programs. Its results closely match experimental data and are compatible with GIS and Excel for environmental analysis.

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Published on: January 16, 2020

Area of Science:

Environmental Science
Electromagnetism
Geographic Information Systems (GIS)

Background:

Existing software for calculating magnetic induction fields from power lines presents challenges in data processing and complex configuration representation.
The Regional Environment Protection Agency of Friuli Venezia Giulia (ARPA FVG) identified limitations in current tools for compliance with Italian regulations.

Purpose of the Study:

To evaluate existing software for magnetic induction field calculations from power lines.
To introduce and assess the innovative software, Phidel, for improved accuracy and usability in environmental magnetic field analysis.

Main Methods:

Analysis and comparison of existing magnetic induction field calculation software.
Testing of the Phidel software against agency requirements and experimental measurements.
Evaluation of data output compatibility with GIS and Excel environments.

Main Results:

Existing software showed difficulties with immediate data processing and complex power line configurations.
Phidel software effectively addressed these issues, providing results closest to experimental measurements.
Phidel's output is compatible with GIS and Excel, facilitating digital cartography overlay and determination of 3 and 10 μT bands.

Conclusions:

Phidel represents an advancement in software for calculating magnetic induction fields from power lines.
The software's accuracy and data compatibility support compliance with environmental regulations, specifically Italian Decree of the President of the Council of Ministers of 8 July 2003.
Phidel enhances the ability to perform environmental magnetic field assessments and integrate results into spatial analysis tools.