Assessment: Magnetism
Answer every question, then submit to see your score and which topics to review.
Part A — Concept Questions
Which pair of magnetic poles will ATTRACT each other?
EasyWhat best describes a magnetic domain?
MediumPart B — Formula & Application
In a diagram of the magnetic field around a bar magnet, where are the field lines drawn closest together?
MediumSteel is chosen for making permanent magnets mainly because:
MediumPart C — Problem Solving
Placing an unmagnetized iron rod inside a coil carrying a strong steady electric current magnetizes the rod. What process does this demonstrate?
MediumA student has four unlabeled metal rods; only one is an UNMAGNETIZED iron rod, the rest are non-magnetic metals. Which single test correctly identifies the iron rod?
MediumPart D — Real-Life Application
Why does heating a magnet strongly cause it to lose its magnetism?
MediumA scrap-yard crane uses an electromagnet to lift heavy scrap metal, then instantly drop it by switching off the current. Which material should its core be made from?
MediumPart E — Challenge
Two bar magnets are placed end to end with a small gap, a north pole facing a south pole. What is true of the magnetic field in that gap?
HardA steel bar is magnetized by stroking it repeatedly, always in the SAME direction, with a strong magnet. Why does this produce a stronger magnet than stroking it back and forth in random directions?
Hard0/10 answered