0
Rate this Study Guide:
☆☆☆☆☆60
they show wich way iron shavings would align themselves
They always make closed loops.
Electric field lines can either form closed loops or they can start and finish on isolated electric charges. Magnetic field lines always only form closed loops.
When a fuse blows, you should replace the fuse and check to see what might have caused it to blow. It's a sign that there might be something causing too much current to flow in the circuit.
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.
Atoms are made of different numbers of protons, neutrons, and electrons. Protons (positive charge) and Neutrons (neutral charge) make up the nucleus of the atom. The incredibly small electrons (negative charge) follow orbitals around the nucleus in what's known as an Electron Cloud.
An example where this is not true, however, is a hydrogen atom. It has only one proton and one electron. Because it only has one proton, it does not naturally have any neutrons as no buffer is needed between protons.
voltage
A short answer:
An electric fence is connected to the ground only when an animal or a human being touches it to complete a circuit from the fence to the ground.
A longer answer:
The wires of an electric fence are not connected directly to the ground because, if that was done, the fence would be shorted out and would not be able to do its job!
This is how an electric fence is actually hooked-up: the electric fence is connected to one side of a specially designed high voltage source and the return side of that source is connected to the ground.
Then, whenever the skin of any animal - or human - touches the wire whilst standing on the ground in bare feet, they get a high-voltage (10,000) DC electric pulse from the electric fence. The shocks are designed to be only enough to make them jump back from the fence, not to "electrocute" them so badly as to cause serious injury or death.
not magentic
an increase in current, hence increased power and increased heat.
Credit card, an access card you scan for entry into a building !
You would need to be standing on some kind of electrical insulator, such as a rubber mat, or on very dry ground.
a copper wire carrying current and another magnet.
Protons and electrons both have a positive or negative charge, but neutrons have no charge.
