After liquid helium is cut off, the temperature could rise up and reach temperature. Under these circumstances, the magnet can demagnetise
When you pass an electric current through a copper wire that is wound around a magnet, it creates a magnetic field that aligns with the magnetic field of the magnet. This process strengthens the overall magnetic field around the magnet, effectively increasing its power. This principle is the basis of how electromagnets work.
Hitting a magnet may affect its magnetic domains and thus may remove its internal magnetism, thus the magantism may be reduced or even removed by hitting it.
No, soaking a magnet in water does not affect its power. Magnets are typically not affected by water or other liquids, so it should not impact its magnetic strength.
Nuclear fusion on the sun changes hydrogen into helium. This process releases energy in the form of light and heat. It is the source of the sun's power and the reason for its brightness and warmth.
a magnet that remains magnetized for only a small time interval as compared to a permanent magnet.
The "body scanners" that use it are Magnetic Resonance Imaging, or MRI, machines. (The scanners at airports are akin to radar sets, and don't use liquid helium.) MRI machines contain a very large electromagnet. To keep the thing from requiring its own power plant, an MRI magnet is wound with superconducting wire - wire with, effectively, no resistance. Superconducting wire must be kept at the temperature of liquid helium if you want it to superconduct.
Electric Power
No.If you break the magnet, it is still a useful magnet.
With magnets
That's called a permanent magnet.
Liquid helium is colder than anything else on the face of the Earth. They cool the magnets with helium so the wire they're made out of will superconduct - flow electricity with no resistance. The LHC's magnets use 1.5 million watts of power all tolled; imagine how much they would need if the wire had even a thousandth of an ohm per meter resistance!
because it is
by the power of the magnet.
When a magnet is dropped, it loses some of its power to other magnetic materials in its surroundings. This can occur when the magnet aligns with the poles of another magnet or when it induces a magnetic field in a nearby object, causing it to become magnetized temporarily.
A hot air balloon doesn't contain helium.
For power of cource
When the time is shorter, the power used remains the same. Power is calculated as the rate at which energy is consumed, so if the time taken to consume that energy is shortened, the power consumption will be higher during that shorter time period.