The SI unit of magnetic flux density is the
- A. weber
- B. tesla
- C. henry
- D. gauss
Explanation
One tesla is one weber per square metre, so the tesla measures flux density while the weber measures the total flux. The tesla is a large unit: the Earth's field is only about 50 microtesla, while an MRI scanner reaches 1.5 T or more. The henry is the unit of inductance and the gauss is the old CGS unit, with 1 T equal to 10,000 gauss.
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