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

Step 1: Identify the quantity.
The magnetic field, also called magnetic flux density and written $B$, measures how strong the magnetic effect is at a point. We want its unit.

Step 2: Recall the SI unit.
The SI unit of magnetic field is the tesla, named after Nikola Tesla. We can also express it using flux and area.

Step 3: Connect flux and field.
Magnetic flux is measured in weber. Magnetic field is flux spread over area, so its unit is weber per square metre.

Step 4: Relate tesla and weber per square metre.
\[ 1\ \text{tesla} = 1\ \text{weber}/\text{m}^2 \] So the two ways of writing it are the same.

Step 5: Check the other options.
Weber alone is the unit of flux, not field. Weber per metre is not a standard unit of field. So those do not fit.

Step 6: State the unit.
The correct unit for magnetic field is weber per square metre. Therefore \[ \boxed{\text{Weber}/\text{m}^2} \]