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What pattern of striping at a mid ocean ridge would you expected find if the magnetic polarity changed many times over a short period?
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How can the magnetic flux associated with coil or a closed circuit be changed?
A simple method for altering the magnetic flux would be to change the amount of current flowing in the coil or circuit. Generally speaking, more current, more magnetic flux, and vice versa.
Why are there magnetic strips on the ocean floor what do they mean?
The earth maintains a magnetic field due to the metals that make up its core. Thus, all rocks are influenced by this magnetic field and "face" the direction the field is "facing". Every few hundred million years the poles switch, and with it the magnetic field. Similarly, all rocks "face" the new direction. Magnetic strips are indicators of when the magnetic field of the Earth changed.
What is the magnetic charge of the South Pole?
Negative is the current magnetic charge of the Earth's South Pole.But such has not always been the situation. Scientists suggest that the charge changed from positive to the current negative about a million years ago. At the same time, the North Pole's magnetic charge changed from negative to its current positive.AnswerWe do not describe a magnetic pole as a 'charge', and the terms 'positive' and 'negative' are not applied to magnets. Magnetic poles are described as being 'north' and 'south', whereas electric charges are described as being 'positive' or 'negative'.Having said this, it should be mentioned that people involved with magneto therapy do describe magnetic poles as being 'positive' and 'negative', but this is a pseudoscience and much of its terminology is nonsense.
Can the polarity of gasoline be changed with magnets?
Because the molecules in gasoline are inherently non-polar, it takes an extremely strong magnet to cause any polar effect on them. Even the electromagnets used on cranes to pick up junk cars and move them around in junk yards are not strong enough to change the polarity of gasoline noticeably. Any magnet strong enough to induce a noticeable polarity in the molecules in the gasoline would have a catastrophic effect on the metal moving parts of the engines it is burned in and as soon as the gasoline was removed from the magnetic field of the magnets it would revert to its normal non-polar state. Magnets cannot induce any permanent change in the polarity of gasoline. As a caveat - a little bit of polar materials are often added to gasoline to aid in complete combustion and to impart some engine cleaning properties to the gasoline, but even those molecules are not very much affected by anything short of extremely strong magnetic fields, albeit not quite as strong as are required to affect non-polar molecules. No magnet you could fit under the hood of a car would be strong enough to have any noticeable effect on the gasoline - the only effect you could hope to see would be to have a magnet messing up the movement of the metal parts of the engine.
Primary voltage is 5V and secondary is 30V the primary magnetic field is 15N what would the secondary magnetic field be?
This is a trick question. A transformer transforms voltage and currents. The magnetic field strength of 15 Newtons (a measurement of force, or power) is not changed - in other words what you put into a transformer (in terms of power) you get out the other side (minus losses). so 15N in, 15N out. You can also think of it this way: voltage is applied to the primary side, which induces a magnetic field. This magnetic field induces a voltage in the secondary side. So the magnetic field produced in the primary side is the same magnetic field that produces the secondary voltage. Thus the answer is in the question - the magnetic field is 15N (there's only one).
How has the magnetic compass changed the world?
No!
What would happen to electronics magnets etc if the earths magnetic poles changed?
Nothing - The polarity of an electromagnet depends on the direction of current flow and you can effect the same change in orientation to the earth's field by moving the electromagnet rather than the earth's field.
How can scientists tell if the earths magnetic field has changed?
Sediment cores taken from deep ocean floors tell scientists about magnetic polarity shifts which provides a direct link between magnetic field activity and the fossil record . The Earth's magnetic field determines the magnetization of lava as it is laid down on the ocean floor on either side of the Mid-Atlantic Rift where the North American and European continental plates are spreading apart . When the lava solidifies it then creates a record of the orientation of past magnetic fields much like a tape recorder records sound .
Why are permanent magnets not used in cranes to lift heavy loads?
They can become demagnetized by impact, if they're picking up something which is also magnetic (which steel is), the magnet would need to be changed when the polarity was wrong, and then there's the matter of how you detach the magnet once you got the load into place.
Who invented magnetic core memories for the computer?
no idea, but its called a hard drive. Core memory has nothing whatsoever to do with hard drives. Core memory is more analogous to RAM, but was made of small metal or ceramic rings through which wires were threaded. Applying voltages to the wires changed the magnetic polarity of the rings, allowing them to represent "on" and "off" states. See the Related Link for much more information.
What happen to the magnetic field of a wire when change the direction of the current in the wire?
Direction of the magnetic lines too would get changed
What happens to magnetic field of a wire when you change the direction of the current in the wire?
Direction of the magnetic lines too would get changed
Magnetic chuck of lathe machine?
I don't know what your asking, so, a magnetic chuck screws on to the lathe spindle head, the magnetic chuck in its self has a magnet where the polarity can be changed, turn the handle one way and the chuck will hold the part to the chuck, turn it the other way and it releases the part. They also have electrical magnetic chucks and plates, (mostly the plates for this type) this type is powered by electricity through a cord, this type has basically 3 setting, full power on, full power off, and residual, which is around 1/2 power.
What are the two polarities used with direct current welding?
reverse polarity and straight polarity The answer is right but a bit of furthur explanation is required. Polarity can be changed in DC output welding sets. The heat of the welding arc is concentrated on the positive terminal. So when thick plates are welded as more concentration of heat is required on the job the job is kept +ve ie. straight polarity is used. For thin plates concentration of heat is on the filler rod ,so reverse polarity is used.
Why does the rotation of the motor reversed when change the polarity across the main winding coil?
When changing the auxilary face winding connection the current flow in the winding is changed so that the rotating emf direction is changed . Thats why the motor rotates in opposite direction.
What happen to magnetic compass if the current is changed?
If an electric current flows through a wire, it will create a magnetic field. ... a ship or an airplane, it can damage or otherwise change the ship's magnetic compass.
How can rocks tell how the polarity of the earth has changed?
During the Second World War, linear bands of positive and negative magnetic anomolies were found in the ocean floor, stretching for hundreds of miles, with an almost perfect symmetry either side of mid-ocean ridges. It was realised that these anomalies were evidence of periodic reversals of the earth's magnetic field. Molten basalt had been magnetised in the direction of the field and then cooled to 'fossilise' that direction. Each time the earth's magnetic field reversed, a stripe was added in the opposite direction.
