When the magnetic flux is said to be neutral?

Explanation

To determine when the magnetic flux is said to be neutral, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding 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, taking into account the angle (θ) between the magnetic field and the normal (perpendicular) to the surface area. Mathematically, it is given by:
\[
Φ = B \cdot A \cdot \cos(θ)
...