What contributes more to the attractive force between a magnet and a thin piece of metal - the magnet's surface area, or its thickness? [more inside]
posted by howling fantods on Nov 5, 2009 - 5 answers

How should I display my collection of travel magnets? [more inside]
posted by lbo on Oct 10, 2009 - 9 answers

Are Erector Set pieces ferromagnetic? Paramagnetic? Neither? [more inside]
posted by Jimmie on Jul 7, 2009 - 5 answers

How much do criss-crossing electromagnetic waves affect one another? [more inside]
posted by Eiwalker on Feb 21, 2009 - 8 answers

Audio experimentation: How do I wire up these tape heads? [more inside]
posted by godawful on Aug 14, 2008 - 2 answers

Do I have magnetic superpowers? [more inside]
posted by Alabaster on May 28, 2008 - 14 answers

We ate at Sonic last night and got a cool kids toy that consisted of marble run type pieces with magnetic backs for fridge use. However, instead of a marble, it had a wheel that rides the rails. My son has a birthday at the end of June and I would like to get a large set of these. I can only find the type with marbles, no good in my house. Where can I find the wheel type fridge roller coaster that will keep a 6 and 2 year old busy for hours?
posted by Talia Devane on May 24, 2008 - 6 answers

Physicsfilter: Is the magnetic flux passing through an area Φ = BA or is it Φ = nBA*cos(θ)? [more inside]
posted by PuGZ on Nov 13, 2007 - 10 answers

I have an audio cassette tape which has been waterlogged and soaked in dirt for over 10 years. What are my options for respooling/fixing the tape with its contents intact? [more inside]
posted by 0bvious on Dec 26, 2006 - 12 answers

Is there an easy-to-use, on-line mapping site that can optionally indicate magnetic north on large-scale map images? [more inside]
posted by Dave 9 on Jul 5, 2006 - 3 answers

What is the cheapest and most user-friendly magnetic stripe card writer? (A hi-co writer is greatly preferred.) [more inside]
posted by Symeon on Apr 22, 2006 - 4 answers

We want to hang our pots and pans from the HVAC ductwork on our kitchen. We're thinking strong magnetic hooks. [mi] [more inside]
posted by MrMoonPie on Sep 28, 2004 - 4 answers