A current that is perpendicular to one of those entities produces a potential difference known as the Hall Effect.
When these entities are extremely weak, their strength is often measure using a device called a SQUID. NMR spectroscopy involves chemical shift when a sample is placed in one of these entities. A current that is perpendicular to one of those entities produces a potential difference known as the Hall Effect. According to Ampere's law their strength is proportional to the electrical current. Their strength, which is a measured in a unit called (*) Teslas, can be determined using the Biot-Savart law. For 10 points, name this type of vector field caused by moving electric charges.
When these entities are extremely weak, their strength is often measure using a device called a SQUID.
{magnetic} fields