Posted by: bshal March 6, 2013
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@kiddo,
Take one rod and touch with its end the middle of the second rod. If they get closer, then you have a magnet in your hand. The real magnet will have a magnetic field at its poles, but not at its center. So, if you take the iron bar and touch its tip to the magnet's center, the iron bar will not be attracted.
Here is mine again:
Suppose you're in a hallway lined with 100 closed lockers. You begin by opening every locker. THen you close every second locker. Then you go to every third locker and open it (if it's closed) or close it (if it's open). Lets call this action toggling a locker. Continue toggling every nth locker on pass number n. After 100 passes, where you toggle only locker #100, how many lockers are open?
Take one rod and touch with its end the middle of the second rod. If they get closer, then you have a magnet in your hand. The real magnet will have a magnetic field at its poles, but not at its center. So, if you take the iron bar and touch its tip to the magnet's center, the iron bar will not be attracted.
Here is mine again:
Suppose you're in a hallway lined with 100 closed lockers. You begin by opening every locker. THen you close every second locker. Then you go to every third locker and open it (if it's closed) or close it (if it's open). Lets call this action toggling a locker. Continue toggling every nth locker on pass number n. After 100 passes, where you toggle only locker #100, how many lockers are open?