If you're hiking or exploring the wilds and you lose or bust your compass you can make a rudimentary compass by floating a magnetized needle. Instead of looking for a pond or puddle to hold your ...

If shrunken down to micron size, a compass needle could wobble. (Courtesy: iStockphoto/tobias machhaus) A tiny magnetic needle just 10 μm long could be used to create a magnetic-field sensor that – if ...

Q. Why does a compass needle always get aligned in the north-south direction? Ans. The particular alignment of the compass needle is attributed to the interaction between two magnets. All magnets have ...