Magnetic field strength, often represented by the symbol B, refers to the intensity of a magnetic field at a specific point in space. It is measured in units called teslas (T) or gauss (G), where 1 tesla equals 10,000 gauss. The strength of a magnetic field can vary depending on the distance from the source, such as a magnet or an electric current. The magnetic field strength is crucial in various applications, including electric motors, transformers, and MRI machines. Understanding this concept helps in designing devices that rely on magnetic forces, ensuring they operate efficiently and effectively.