4 A student says that an electromagnet is stronger when it has an iron core because the electric current flows through the iron as well as the wire. Is this correct? What would
you say to the student?

What statements accurately describe atoms

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.

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?