Assertion: magnetic field | /r/CreatedBy | electric currents
Facets:
Source sentences:
text: The first was Hans Christian Ørsted’s accidental discovery of the influence of an electric current on a magnetic needle—namely, that magnetic fields are produced by electric currents.
text: The magnetic field produced by an electric current is always oriented perpendicular to the direction of the current flow.
text: Earth's magnetic poles exist because of its magnetic field, which is produced by electric currents in the liquid part of its core.
text: Magnetic fields, on the other hand, are produced by electric currents and are only present when an appliance is operating i.e. there is no magnetic field when an electrical appliance is turned off.