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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.1K
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...
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Eddy Currents01:25

Eddy Currents

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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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.
6.0K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.3K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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LOW FREQUENCY MAGNETIC FIELDS INSIDE CARS.

R Pääkkönen1, L Korpinen2

  • 1Tmi Rauno Pääkkönen, Tampere, Finland.

Radiation Protection Dosimetry
|November 9, 2019
PubMed
Summary

Magnetic fields in electric, petrol, and hybrid cars were measured. All tested vehicles showed magnetic flux densities well below safety guidelines, with electric cars having slightly lower fields than hybrid and petrol cars.

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Area of Science:

  • Environmental Science
  • Electromagnetism
  • Automotive Engineering

Background:

  • Concerns exist regarding electromagnetic field (EMF) exposure in vehicles.
  • Understanding EMF levels in different car types is crucial for passenger safety.
  • Electric vehicles (EVs) utilize different powertrains that may influence EMF generation.

Purpose of the Study:

  • To compare magnetic field (MF) magnitudes inside passenger seats of electric, petrol, and hybrid cars.
  • To assess EMF exposure levels relative to established safety guidelines.
  • To identify potential differences in MF emissions between various vehicle powertrains.

Main Methods:

  • Magnetic flux density measurements were taken inside the passenger seats of electric, petrol, and hybrid vehicles.
  • Vehicle EMFs were recorded during a 5 km drive in an urban setting.
  • Data were collected and compared across the different car types.

Main Results:

  • Magnetic flux densities within all tested cars were consistently low, not exceeding 2.6 μT.
  • Petrol and hybrid cars exhibited similar MF magnitudes, while electric cars showed slightly lower levels.
  • Measured MF values represented less than 3% of the established guidelines for the general population and pacemaker users.

Conclusions:

  • Passenger exposure to magnetic fields in electric, petrol, and hybrid cars is minimal.
  • Electric cars may offer a slight advantage with marginally lower magnetic field emissions.
  • Current EMF levels in these vehicles pose no significant health risk based on existing safety standards.