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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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 of a Solenoid01:18

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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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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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 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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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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Related Experiment Video

Updated: Aug 25, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Single NV centers array preparation and static magnetic field detection.

Zong-Da Zhang, Si-Yu Yin, Li-Cheng Wang

    Optics Express
    |October 15, 2022
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed an array of single nitrogen-vacancy (NV) centers for precise static magnetic field vector and gradient detection. This method enhances accuracy and consistency in magnetic field measurements.

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    Area of Science:

    • Quantum sensing
    • Materials science
    • Nanotechnology

    Background:

    • Static magnetic field detection faces challenges in accuracy and consistency.
    • Nitrogen-vacancy (NV) centers in diamond are promising quantum sensors.

    Purpose of the Study:

    • To develop an array of single NV centers for improved static magnetic field vector and gradient detection.
    • To address limitations in current magnetic field measurement techniques.

    Main Methods:

    • Fabrication of a single NV center array using femtosecond laser direct writing.
    • Characterization of NV centers for low defect density and stress uniformity.
    • Achieving an average spatial positioning error of 0.2 µm.

    Main Results:

    • Demonstrated high-accuracy magnetic field vector and gradient measurement capabilities.
    • Achieved a Z-axis gradient sensitivity (GBZ) of approximately -0.047 µT/µm.
    • The NV center array exhibited minimal impurity defects and good stress uniformity.

    Conclusions:

    • The developed single NV center array offers a novel approach for high-precision magnetic field measurements.
    • This method provides a new pathway for large-range, accurate static magnetic field vector and gradient detection.