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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Magnetic Field Of A Current Loop01:16

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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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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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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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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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
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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.
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Related Experiment Video

Updated: Oct 8, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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A high performance active noise control system for magnetic fields.

Tadas Pyragius1, Kasper Jensen1

  • 1School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.

The Review of Scientific Instruments
|January 1, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces an active noise control system using a filtered-x least mean squares algorithm to cancel environmental magnetic field noise. The system effectively suppresses both broadband and specific AC line noise across all magnetic field directions.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Signal Processing

Background:

  • Environmental magnetic fields pose challenges for sensitive measurements.
  • Traditional shielding methods are often insufficient or impractical.

Purpose of the Study:

  • To develop and evaluate an active noise control system for magnetic fields.
  • To demonstrate effective noise suppression using an adaptive algorithm.

Main Methods:

  • Implementation of a filtered-x least mean squares (FXLMS) adaptive algorithm.
  • Utilizing a sensor network to detect ambient noise and measure the signal of interest.
  • Generating an anti-noise signal to cancel local magnetic field noise.

Main Results:

  • Achieved up to 35 dB root-mean-square noise suppression in the DC-1 kHz band.
  • Demonstrated 55 dB and 50 dB amplitude suppression for 50 Hz and 150 Hz AC line noise, respectively.
  • Effective noise cancellation across all three axial directions of the magnetic vector field.

Conclusions:

  • The proposed active noise control system is highly effective for magnetic field noise reduction.
  • The FXLMS algorithm provides robust performance in canceling complex magnetic noise.
  • This technology has potential applications in sensitive magnetic field measurement environments.