What is the strength of magnetic field known as _____

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Examoogle · Accepted Answer

Magnetic Flux Density

Explanation: Magnetic Flux Density, denoted by B, is defined as the magnetic flux per unit area passing through a surface perpendicular to the direction of the magnetic field. It represents the intensity or strength of the magnetic field at a specific point in space.

Working Principle: The strength of a magnetic field is defined by the density of the magnetic flux lines. According to Faraday's law and Biot-Savart law, a current-carrying conductor or magnetic material generates field lines; the closer these lines are to each other, the higher the magnetic flux density, indicating a stronger magnetic field.

Key Formulas: $B = \frac{\Phi}{A}$ — Where B is magnetic flux density (Tesla), Φ is magnetic flux (Weber), and A is area (m²); $B = \mu H$ — Relation between flux density, permeability (μ), and magnetic field intensity (H)

Key Points: SI unit of Magnetic Flux Density is Tesla (T) or Weber/m².; It is a vector quantity having both magnitude and direction.; The CGS unit of magnetic flux density is Gauss (1 T = 10,000 Gauss).; Magnetic flux (Φ) is the total quantity of field lines, whereas density (B) is the concentration per unit area.

Advantages: Provides a localized measure of magnetic field strength.; Essential for calculating inductance and transformer performance.

Disadvantages: Depends on the orientation of the surface relative to the field lines.; Measurement is affected by the permeability of the medium.

Applications: Design of electromagnetic motors and generators.; Transformer core saturation analysis.; Magnetic storage devices and read/write heads.

Additional Info: Magnetic Flux (Φ) is measured in Webers (Wb).. Option A (Flux) represents the total quantity of magnetic field lines. Option B (Density) is incomplete terminology. Option C (Magnetic strength) is a vague term often used interchangeably with field intensity (H) or flux density (B) depending on context, but 'Magnetic Flux Density' is the scientifically precise term for the strength of a magnetic field at a point.

Answer: D is correct — Magnetic flux density is the standard technical term for the spatial concentration of magnetic field lines (strength per unit area).

Exam Tip: Always distinguish between Magnetic Field Intensity (H in A/m) and Magnetic Flux Density (B in Tesla). Remember: B is the result of applying H to a material ($B = \mu H$).

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