An atom with an equal number of protons and electrons.
____________ charges repel each other.
Electrons move onto the object, giving it a static charge.
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.
The voltages are the same across the branches in a parallel circuit.
The pitch of a sound can be determined by its frequency alone.
electric force can act at a distance bbut is stronger when object are closer
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.
Newtons first Law
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.
Electric and Magnetic
Protons are positive charged particles. Electrons are negative charged particles.
On a nylon carpet in a dry area.
If a home were wired in series, every light and appliance would have to be turned on in order for any light or appliance to work.