Physics

60

Catalysts

because you get closer to the sound

As the ambulance gets closer, the sound waves are compressed relative to the person; so the frequency increases.

friction charging

Magnetic fields do, because there's no such thing as an isolated magnetic "pole",

and a magnetic line always starts and ends at opposite poles of the same

magnetized object.

But electric fields don't. You can easily have a bundle of isolated positive charge

over here and a bundle of isolated negative charge over there, whereupon the

lines of the electric field start on one bundle and end on the other bundle.

But electric field lines can also exist in closed loops, and they do that in radio waves, where the electromagnetic field propagates with an electric field component and a magnetic field component, and they both form closed loops.

voltage

There are a couple of ways to increase the strength of a copper electromagnet. You could increase the current going through the wire or wrap more wire around it which increases the strength exponentially. You could also put in a soft iron core such as a nail which in essence becomes a magnet and increases the strength of the magnet.

Fuse wire is not used in electrical circuits in the home.

AB + C + B is not an equation: an equation requires two sets of compounds on either side of an equality sign. Furthermore, it cannot be any of the following types of reactions because there is nothing following.

All metals are not attracted by a magnet. Most metals are not attracted by a magnet. It is iron and steel which is made from iron that are attracted by a magnet.

Most other metals such a copper, aluminum, zinc, brass, nickel etc. are not attracted to a magnet...

Most great discoveries started out as accidental. The discoverer usually wondered why something happened and began investigating and experimenting to learn about it.

Like charges repel each others.

The force between charges decreases as the distance between them increases.

an increase in current, hence increased power and increased heat.

Magnetic fields can be created by charges or the flow of current.

Electric and Magnetic

None of them does.

You would need to be standing on some kind of electrical insulator, such as a rubber mat, or on very dry ground.

The energy of electromagnet will increase

false