Magnetism

Lets look at the two devices in one, separately first. A reed switch looks like a elongated tiny light bulb. Inside, if your eyesight is good, you can see two overlapping, flat metallic reeds, that don't quite touch each other. Bring a magnet in close proximity and they will make contact, thus potentially closing a circuit. So you put a magnet on a moving object, like a door or window and the reed switch on the surrounding frame. When the door or window is closed and the magnet is very close to the reed switch, say no farther away than a quarter inch or half centimeter, it is activated and you can send some electricity through it, like a switch, to an alarm. Whooops, you probably already see the problem. We want the opposite to happen. We want electricity flowing to our buzzer, bells, lights etc, when the reed switch is open, i.e. magnet removed from proximity of reed switch. That's where the relay comes in because it's a double throw switch. When closed on two terminals, it's open on the other two, so we can reverse the situation with our reed switch by including the relay. Furthermore, relays can handle a lot more electrical current than a tiny , fragile reed switch. We can use the appropriately rated relay to even turn on some high wattage lights, when activated.

Simple: chalk dust has no magnetic properties whatsoever, and is an insulator. As such, the magnetic field will flow right past it as if it weren't there, so it cannot position itself accordingly.

In an electromagnet, the magnetic field produced by the flow of electric current through a coiled wire interacts with the permanent magnet on the drive shaft, causing it to rotate. This rotational motion of the drive shaft is what is responsible for performing work in devices like motors or generators.

There is no scientific evidence to support the use of magnets for healing purposes. It is best to consult with a healthcare professional for evidence-based treatments for any health concerns.

Its called South Pole and North Pole but when you put north pole to north pole it will push away from each other same when you put south pole to south pole it will push away.

A freely suspended magnet aligns itself in the north-south direction because the Earth itself acts like a giant magnet with its magnetic poles located near the geographic North and South poles. The magnetic field of the Earth exerts a force on the magnetic poles of the freely suspended magnet, causing it to align north-south.

Canadian 50 cents pieces

1911-1919 .925 silver

1920- 1967 .800 silver

collector sets such as, butterfly, hockey legends, nature series etc all .925 silver

you find if it is silver by using a magnet, magnets won't pick up a silver coin

Silver is too soft to be pure, old silver coins are usually very worn, the copper is added to make it stronger and last longer. the new collector coins can be .925 silver, because they are in protective cases. If you have a new one, keep it in the case, older ones in great shape should be placed in a case asap. and never never never clean a silver coin, it takes away from the value or wears away some of the silver.

A freely suspended magnet always points in north - south direction. This is because its south pole is attracted by earth 's north pole and the north pole of the magnet is attracted by the earth 's south pole. when we hang it freely it automatically starts pointing in north-south direction. The magnetic compass also works on the same principle.

Probably not.

You need a ferromagnetic material for a magnet to stick. There are basically three elements that are ferromagnetic: Cobalt [Co]; Nickel [Ni]; & Iron [Fe] (and some esoteric ones too). If the metal alloy that has been plated with silver to make the "silver plate" has enough of these then a magnet will stick, of these, only Nickel is commonly a component of alloys that are plated but often not in concentrations that are sufficient to make it obviously magnetic.

The relative density of lines in a magnetic field diagram indicates the strength of the magnetic field in that region. A higher density of lines represents a stronger magnetic field, while a lower density indicates a weaker field. The spacing between the lines also gives an idea of the field's intensity, with closer lines indicating stronger magnetic force.

What is little known, is that the whole of the UK is a giant magnet. This is why poles are attracted to it!

A permanent magnet is always on; there isn't any way to turn it off. An electromagnet can be controlled; you can turn it on or off, or change the amount of magnetism by varying the current passing through the coils.

No, the "lead" in pencils is made of graphite, which is not magnetic. Magnetic materials, like iron, cobalt, and nickel, have properties that attract to a magnet, while non-magnetic materials, like graphite, do not.

Hemoglobin is not attracted by an external magnetic field because it is a diamagnetic substance which means it weakly repels magnetic fields. This property is due to the lack of unpaired electrons in its structure, making it largely unaffected by magnetic forces.

A hysteresis curve is a plot, graph or some kind of pictorial representation of the relationship between the magnetic field strength (H) and the magnetic flux density (B) of a material under inspection.

The answer is yes, it will be attracted, and that because of the fact that the electrons that are loose between the atoms of the iron ( and every metal ) have a spin set by the general law of pauli ( hund's law ) so as that their magnetic quantum number is maximum . If one adds these quantum numbers ( spins ) it will be observable that iron in any form ( rusty or not ) is eligible to being attracted by a magnet since each of its electrons' energy is slightly changed due to their spins thus creating a dipole.

Yes, a grain-oriented form of iron called mu-metal is used as a screen of magnetic fields for such things as CRT's. This material has a high magnetic permeability, called mu (the Greek letter) in the trade, hence mu-metal. Effectively it 'short circuits' a magnetic field.

A double screened cage called a Faraday Cage does the same function for electromagnetic fields.

This question is asked kinda in a weird way. People have always thought magnetism and electricity are separate things. So it wasn't any one person who made that distinction. However, you want to know who were the first ones to connect the two ideas, I think they are Ampere and Faraday.

Magnets are used in a number of household items.

First, anything with a motor:

Refrigerator

Dishwasher

Ceiling Fan

Garbage Disposal

Furnace

Additionally, the seal around your refrigerator door may have a magnet to get a good air seal. Older kitchen cabinets had magnetic latches as well.

Yes, the North and South poles of a magnet attract each other. Furthermore, two North or two South poles will repel each other and no matter how many times you cut a magnet in half, it will always have a North and South pole.

Several factors can weaken the magnetism in a magnet such as being stored close to heat, strong electrical currents, other magnets, or radiation. Over time magnet materials lose a very small amount of magnetism.

The three naturally occurring magnetic metals are iron, nickel, and cobalt. These metals have strong magnetic properties due to their atomic structure, which allows them to align their magnetic domains and create a magnetic field.

The magnitude of the magnetic field around a permanent magnet is greatest at the poles of the magnet. This is where the magnetic field lines are most concentrated and where the magnetic force is strongest.

No, a magnet cannot have more than 2 poles. Magnets are always dipolar, meaning they will always have a north pole and a south pole. Any region on a magnet will exhibit either north or south pole characteristics.