Approximately how many years has the sun been active? 3.5 billion 4.5 billion 5.5 billion 6.5 billion

According to science its 5 billion years

And This Isn't in your option so we can say 4.5 billion years.

0.19 m/s and 0.45 m/s

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop