The electrostatic force between two bodies is proportional to the product of their two charges. If the charge on A is increased this product increases in size (it must have been non-zero to begin with, since there was a force between them at first). Thus, the force between them rises.
Ye sit does. But since people weren’t there to hear it, doesn’t mean that it didn’t make a sound.
There is a limited amount of energy in the universe since it cannot be destroyed or created only transferred. This being said, eventually the universe will have expanded to vastly that all of its energy will be spread too thin for any form of life to be possible.
AC can be produced using a device called an alternator. This device is a special type of electrical generator designed to produce alternating current. A loop of wire is spun inside of a magnetic field, which induces a current along the wire.
The "gas" is ionized and may correctly be described as a fourth state of matter - a plasma - rather than a gas. Both a gas and a plasma would expand indefinitely if not contained somehow but the ionized particles of a plasma could be controlled electromagnetically whereas a gas could not. A typical plasma is contained in an illuminated neon sign.