What is the SI unit of magnetic flux?

Options

A. Tesla
B. Weber
C. Henry
D. Ampere

Explanation

To determine the SI unit of magnetic flux, we can follow these steps:

### Step 1: Understand the definition of magnetic flux
Magnetic flux (Φ) is defined as the product of the magnetic field (B) and the area (A) through which the field lines pass. Mathematically, it can be expressed as:
\[ \Phi = B \cdot A \]

### Step 2: Identify the units of magnetic field (B)
The magnetic field (B) is measured in teslas (T). One tesla is defined as one weber per square meter:
\[ 1 \, T = 1 \, \frac{Wb}{m^2} \]

### Step 3: Identify the units of area (A)
The area (A) is measured in square meters (m²).

### Step 4: Combine the units to find the unit of magnetic flux
Now, substituting the units of B and A into the equation for magnetic flux:
\[ \Phi = B \cdot A = T \cdot m^2 \]
Since \(1 \, T = 1 \, \frac{Wb}{m^2}\), we can express magnetic flux in terms of webers (Wb):
\[ \Phi = 1 \, T \cdot 1 \, m^2 = 1 \, Wb \]

### Conclusion
Thus, the SI unit of magnetic flux is the weber (Wb).

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