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Magnetic Flux Density Formula:
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Magnetic flux density (B) is a measure of the strength of a magnetic field at a given point. It represents the amount of magnetic flux through a unit area perpendicular to the direction of the magnetic field, measured in teslas (T).
The calculator uses the formula for magnetic flux density around a straight current-carrying wire:
Where:
Explanation: This formula calculates the magnetic field strength at a distance r from an infinitely long straight conductor carrying current I.
Details: Magnetic flux density is crucial in electromagnetism, electrical engineering, and physics. It helps in designing electromagnets, motors, transformers, and understanding magnetic field effects.
Tips: Enter current in amperes (A) and distance in meters (m). Both values must be positive numbers greater than zero.
Q1: What is the permeability of free space?
A: μ₀ = 4π×10^{-7} H/m is a fundamental physical constant that represents how much resistance the vacuum of space offers to the formation of a magnetic field.
Q2: Does this formula work for all wire configurations?
A: No, this specific formula applies only to straight, infinitely long wires. Other configurations (loops, solenoids) have different formulas.
Q3: What are typical values of magnetic flux density?
A: Earth's magnetic field is about 25-65 μT, refrigerator magnets are around 5 mT, and MRI machines can produce 1.5-3 T.
Q4: How does distance affect magnetic field strength?
A: The magnetic field strength decreases inversely with distance from the wire (B ∝ 1/r).
Q5: What safety considerations are important?
A: Strong magnetic fields can affect medical devices, magnetic storage media, and may have biological effects at very high intensities.