We’ve all done the experiment. The teacher brings out a dusty box of permanent bar magnets and everyone spends the rest of the lesson sprinkling iron filings over their desk, or worse, taking countless reading from a compass.
We’ve all done the experiment. The teacher brings out a dusty box of permanent bar magnets and everyone spends the rest of the lesson sprinkling iron filings over their desk, or worse, taking countless reading from a compass.