Question

Unit for magnetic field.

• A. Weber/m\(^2\)
• B. Tesla Nikola
• C. Weber/m
• D. Weber

Hint:

Remember the hierarchy: Magnetic Flux ($\Phi$) is measured in Weber (Wb), and Magnetic Flux Density (field, $B$) is measured in Tesla = Wb/m$^2$. The relation is $B = \Phi/A$, so dividing Weber by m$^2$ gives the unit of $B$. ``Tesla'' is simply the name given to this derived unit, honoring Nikola Tesla.

Answer 1

The Correct Option is A

Concept:
The magnetic field (also called magnetic flux density) is denoted by the symbol \(\mathbf{B}\). It describes the strength and direction of a magnetic field at a point in space. The SI unit of magnetic field/magnetic flux density is the

Tesla (T), named after Nikola Tesla, which is equivalent to other derived SI units.

Step 1: Understand the definition of the Tesla unit.
The Tesla is defined as:

Step 2: Understand the Weber.
The Weber (Wb) is the SI unit of

magnetic flux (denoted $\Phi$), not magnetic field. It measures the total magnetic field passing through a surface.
Therefore:
= Wbm^2 = Webermetre^2.
]

Step 3: Analyse each option carefully.

• (A) Weber/m$^2$: This is correct. \(1 \text{ T} = 1 \text{ Wb/m}^2\). This is the unit of magnetic flux density $B$.

• (B) Tesla Nikola: ``Tesla Nikola'' is not a unit --- Tesla is the unit, Nikola Tesla was the scientist. The unit is simply ``Tesla'', not ``Tesla Nikola''.

• (C) Weber/m: This is not a standard unit of magnetic field. Weber/m would be used in some other contexts but is not the SI unit for magnetic flux density.

• (D) Weber: Weber is the unit of magnetic flux ($\Phi = B \cdot A$), not the unit of magnetic field strength $B$ itself.

Step 4: Key distinction.
tabular|l|l|

Quantity &

SI Unit
Magnetic flux density (field) $B$ & Tesla (T) $=$ Wb/m$^2$
Magnetic flux $\Phi$ & Weber (Wb)
tabular