Question

Weber is the S.I. unit of

• A. magnetic pole strength
• B. magnetic moment
• C. magnetic flux
• D. magnetic flux density

Answer 1

The Correct Option is C

In electromagnetism, the term "Weber" is used to denote the unit of magnetic flux in the International System of Units (S.I.).

Magnetic flux, represented by the symbol Φ, quantifies the total magnetic field (perpendicular to a surface) over an area. Its mathematical expression is given by the integral of the magnetic field B over a surface S:

Φ = ∫_S B · dA

 

Where:

• B represents the magnetic flux density.
• dA is a differential area on the surface S.

The unit "Weber" is defined such that one Weber (1 Wb) equals one Tesla meter squared (1 T·m²). Thus, Weber serves as the S.I. unit measuring how much magnetic flux passes through a given area.

After analyzing the given options:

Option	Corresponding S.I. Unit
Magnetic pole strength	Ampere-meter (A·m)
Magnetic moment	Ampere-square meter (A·m²)
Magnetic flux	Weber (Wb)
Magnetic flux density	Tesla (T)

Weber is the S.I. unit for magnetic flux.

Answer 2

The Weber (Wb) is the S.I. unit of magnetic flux.

It is defined as the amount of magnetic flux that, linking a circuit of one turn, produces an electromotive force of 1 volt as it is uniformly reduced to zero within 1 second.

Mathematically, magnetic flux \( \Phi \) is given by:

\( \Phi = B \cdot A \cdot \cos(\theta) \)

where:

• \( \Phi \) = magnetic flux in Weber (Wb)
• \( B \) = magnetic flux density (Tesla)
• \( A \) = area (m²)
• \( \theta \) = angle between magnetic field and normal to the surface

Correct Answer: magnetic flux