Hysteresis loss is directly proportional to:
1. **Magnetic field strength (B)**: The stronger the magnetic field, the more energy is lost due to hysteresis.
2. **Frequency of magnetization (f)**: The faster the material is magnetized and demagnetized (i.e., the higher the frequency), the greater the hysteresis loss.
3. **Volume of the magnetic material (V)**: A larger material volume will have more magnetic domains to go through the magnetization cycle, thus increasing the loss.
In simple terms, the hysteresis loss increases when the magnetic field strength, frequency, or material volume increases.