Iron Detector

If you want to know the given material is Iron  then Iron detector will help you...

For making this detector you need
1. One empty small  Soap Cover (rectangle in shape)
2. Two Rubber band
3. One ordinary Magnet
4. One battery and one small LED bulb.
5. One long Copper wire (ordinary wire)


How to make?


First make 4 holes in the middle of the soap box and tie up the two rubber bands there as shown in the picture

Box with rubber bands

 


















Next put your magnet below the Rubber band as shown in the figure

Place your magnet below the rubber band

Next take the copper wire and remove the insulation and cut it into 2 pieces . We can call it as copper wire one and two. First take  Copper wire one and   tie into the rubber band and another part fix into the soap box as shown in the figure below.  Next take the Copper wire two and tie it above the rubber band as shown in the figure.The distance between first wire and second wire must be in between 1 cm 3cm. ie there is no contact in between wire one and wire two.

Box with copper wire

 















Now you take the LED and battery and make a connection as shown in the figure below

Circuit

 

Ok.  now connect the two ends the our copper wire one and two.  As shown in the figure

IRON DETECTOR

ya...  look at the setup.
Suppose you put one iron material on  the box then what will happen ? . Definitely it will attracted by the magnet and the magnet will go up and the two copper wires will be in contact. Then the LED will blink.
And if you remove the Iron material then magnet will go down.
If there is no rubber band in between the two copper wire then the magnet will go fast and destroy the setup.
Cover the set up with paper and now nobody will understand what is inside the soap box.
Tell me how is our Iron detector.