Assertion: magnetic field | /r/HasProperty | changed
Facets:
value: quickly
type: MANNER
Source sentences:
text: But a crack or pit in the material interrupts the eddy current, so the magnetic field is changed, allowing a sensitive magnetometer to sense and localize the flaw.
text: The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding.