At around 4.6 billion years old, the Sun has already burned off about half of its store of Hydrogen. It has enough left to continue to burn Hydrogen for approximately 5 billion years. The Sun is currently a type of star known as a Yellow Dwarf. The Sun has a very strong magnetic field...
Permanent magnets always have their magnetic force. induced magnets are ones that become temporarily magnetized when brought near a permanent magnet. For example, if a magnet is used to pick up a paper clip, the paper clip will become magnetized too, and it will be able to pick up another ...
In addition to current traveling through a wire, magnetism is produced by the spin magnetic moments ofelementary particles, such as electrons. Thus, all matter is magnetic to some degree because electrons orbiting an atomic nucleus produce a magnetic field. In the presence of an electric field, ...
Although we have used the magnetic field of the Earth for decades, it turns out that the magnetic poles actually reverse relatively regularly. The last time this happened was 780,000 years ago and they are a result of spontaneous shifts in the dynamo action of the planets molten iron core. ...
to line up in the direction of the field. Magnetic fieldsforcemoving electrically charged particles in a circular or helical path. This force—exerted on electric currents in wires in a magnetic field—underlies the operation ofelectric motors. (For more information about magnetic fields,see...
Electrons might live forever. Scientists have estimated the minimum lifetime of the electron is about 6.6 × 1028 years – this is 66,000 ‘yottayears’. Since this is about 5 quintillion times the age of the Universe, even if electrons don’t live forever, they may as well do!
Einstein liked to tell a story about when he was five years old and sick in bed how his father brought him a magnetic compass that was the first he�d ever seen. He was fascinated by the fact that the needle always pointed north, pulled by an invisible force. No matter how he twist...
Something disturbed me about this equation, though, so I raised my hand. The subsequent exchange between my teacher and I went something like this: Me:What about viscosity? Teacher:What? Me:Doesn’t fluid viscosity have an effect on flow measurement, just like density?
Earth’s atmosphere is composed of nitrogen (about 78%) and oxygen (about 21%), with small amounts of other gases. Earth’s magnetic field is created by its iron-nickel core. Our magnetic field protects the planet from harmful solar radiation. ...
There are more important questions to ask than about a few millimetres of sea level change pa, such as…. “Will civilisation survive when the people who built it are losing their lands under the ice, the Riviera is more akin to the UK South coast and the populations of whole sub ...