You have a permanent magnet whit remanent induction. than you cut a piec of that magnet. if you put that piece back into permanent magnet will the remanent induction be the same it was in begining

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.