What is the strength of magnetic field known as ________

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Examoogle · Accepted Answer

Magnetic flux density

Explanation: Magnetic flux density is defined as the amount of magnetic flux passing through a unit area perpendicular to the direction of the magnetic field. It serves as a measure of the strength and intensity of a magnetic field at any specific point.

Working Principle: The strength of a magnetic field is determined by the density of the magnetic flux lines. When these lines are crowded, the magnetic force is strong; when spread out, the force is weak. Mathematically, it relates the total magnetic flux ($\Phi$) to the cross-sectional area ($A$) through which it passes.

Key Formulas: $B = \frac{\Phi}{A}$ — where $B$ is magnetic flux density (Tesla), $\Phi$ is flux (Webers), and $A$ is area ($m^2$); $\Phi = B \cdot A \cos(	heta)$ — definition of flux in terms of field density

Key Points: The SI unit of magnetic flux density is the Tesla (T), where $1	ext{ T} = 1	ext{ Wb/m}^2$.; It is a vector quantity, possessing both magnitude and direction.; Magnetic flux density is often referred to as magnetic induction.

Advantages: Provides a precise spatial measurement of field strength.; Essential for calculating electromagnetic force (Lorentz force) on moving charges.

Disadvantages: Values can be difficult to measure directly without specialized equipment like Hall effect sensors.; Depends on the orientation of the surface relative to the field lines.

Applications: Design of electrical transformers and electric motors.; Magnetic resonance imaging (MRI) technology.; Data storage in magnetic hard drives.

Additional Info: The CGS unit for magnetic flux density is the Gauss (G), where $1	ext{ T} = 10^4	ext{ Gauss}$.. Options A, B, and C are incomplete or incorrect terminology; 'Fluxd' is a typo, and 'Magnetic strength' is a colloquial term lacking scientific precision.

Answer: D is correct — The strength of a magnetic field at a point is formally known as magnetic flux density.

Exam Tip: Always remember that 'Field Strength' ($H$) is related to 'Flux Density' ($B$) by the permeability of the medium, $B = \mu H$. Don't confuse the two in complex circuit problems.

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