When the iron bar is placed within the coils of a solenoid it then becomes a magnet.
The left hemisphere of the brain is responsible for language and speech
It is called "alternating current" or "ac current".
An alternating current is a current the periodically changes direction. Basically, the voltage difference applied at the two ends of the wire / of the circuit is constantly reversed. This means that at some point electrons travel in one direction, then the voltage is switched (i.e. the polarities are exchanged) and the electrons start to flow into the opposite direction, and so on.
either accept electrons
or
share electrons with an other atom for instance another oxygen atom to create O2
