I read that magnetic fields perpendicular to a current shoot out and expand all the way to infinity.
Additionally a gravitational wave, no matter how small will also expand to infinity at the velocity of light.
Are these correct? If yes, why don't waves "lose" energy while "traveling"?
After reading the answers:
I did not read this statement in a physics book. I read it in a "philosophical" book where the author tries to make a point taking this assertion for granted.
To be specific his exact example is:
We shall take a short piece of wire, connect both its ends to a battery through a switch and close the switch. Three things will happen:
That electrical current will run from one side of the battery to the other
A magnetic field perpendicular to the current will shoot out and expand all the way to infinity at the velocity of light
The wire will heat up slightly
So is this description correct only in a theoretical manner? In reality, due to other objects, will point 2 be invalid?