Magnetic field, a vector field in the neighborhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable. Magnetic fields such as that of Earth cause magnetic compass needles and other permanent magnets to lin
Today’s magnetic shield is generated in Earth’s outer core. The intense heat in Earth’s dense inner core causes the outer core — composed of liquid iron — to swirl and churn, generating electric currents, and driving a phenomenon called the geodynamo, which powers Earth...
Claims that Earth’s magnetic field is responsible for climate change are widespread online, but scientists say the theory has no basis.(但这些地磁事件是造成极端天气、物种灭绝甚至灾难的原因吗?地球磁场导致气候变化的说法在网上广为流传,但科学家表示,这一理论没有根据)”以及划线词上文“It’s not ...
Professor: Okay, keep in mind that solar wind is electrically charged, which means that it interacts with the magnetic field as electromagnetic theory tells us.Okay, how does it interact?Earth, magnetic field deflects most the solar wind, makes it flow around the earth without getting very clo...
Scientists now believe that the Earth's magnetic field is about to reverse. This is called magnetic field reversal. Every 200,000 to 300,000 years, the Earth's magnetic field reverses. In other words, the North and South magnetic poles switch places. This has happened many times in Earth'...
What is the area around a magnet called where magnetic forces are felt? A. Electric field B. Magnetic field C. Gravitational field D. Radiation field Correct Answer B. Magnetic field ExplanationMagnetic field is the area around a magnet. The magnetic field is the region around a magne...
Tags Core Field Magnetic Magnetic field In summary: There is no evidence that the Earth's magnetic field originates in the core rather than elsewhere.There is no evidence that the Earth's magnetic field originates in the core rather than elsewhere.The physical model is compelling, but does no...
Geomagnetic field - Sources, Steady, Magnetic: Observations of the magnetic field of Earth’s surface indicate that more than 90 percent of this field arises from sources internal to the planet. A variety of mechanisms for generating this field have been
This creates a toroidal, or doughnut-shaped field, as the direction of the field propagates outward from the north pole and enters through the south pole. Earth itself is a giant magnet. The planet gets its magnetic field from circulating electric current within the molten metallic core, ...
Understanding key ideas- make sure you can correctly explain a magnetic field Learning practice- use what you know to answer questions about the area where magnetic fields come together and the reason there's a magnetic field around Earth