What is the unit used to measure magnetic field strength?

The unit used to measure magnetic field strength is the Tesla. The Tesla is defined as one weber per square meter and represents the strength of a magnetic field that exerts a force of one newton on a one-meter length of wire carrying a current of one ampere that is perpendicular to the magnetic field. This makes it a fundamental unit in electromagnetism, particularly in understanding how magnetic fields interact with electrical currents and materials.

In contrast, Hertz is a unit of frequency, indicating cycles per second, while Newton is a unit of force. Volt is a unit of electric potential or electromotive force. Understanding the specific roles of these units helps clarify why Tesla is the correct answer for measuring magnetic field strength.