Magnetic Coin Spinner | English
Channel: Arvind Gupta
Date: 2016-01-14

Today with the help of a strong Neodymium magnet and coins we will make a beautiful coin spinner. You will need 2 bottle filled with water, steel ruler, Neodymium disc magnets, and coins which are attracted to magnets. First I will stick a strong Neodymium disc magnet in the center of the steel ruler. On both ends of the ruler is double-sided sticky tape. Stick the tapes on the lids of two bottles filled with water to make a makeshift stand. I have several coins which have nickel in them. That’s why they stick to the magnet. First I stick 2 coins to the magnet. Then I hang two more magnets. So there will 4 coins hanging. Now I will spin the last coin with the help of a flexible straw. I will blow with the straw on the edge of the lowest coin. See how fast the coin spins. This way you can make this magnetic coin spinner. Because these coins have nickel and they are magnetic that is why they stick to one-another and finally to the Neodymium magnet. The magnetism is transferred from the Neodymium magnet down to all the four coins. You can easily spin the last coin by blowing through a straw. You can watch this experiment in a close-up. Because the frictional contact is very low that is why the coin keeps spinning for a very long time. Now we will make a small change in this experiment. First I will stick a strong Neodymium magnet to the base of the glass. I will keep the glass just below the top magnet. Then I will stand coins on the base magnet. You will easily be able to four coins one on top of the other. You can adjust the height of the glass by placing / removing some books below the glass. Now you can see a tower of coins. The topmost coin will be attracted to the top magnet on the scale. Now if I blow on the edge of the top coin with a flexible straw it will spin very fast. The fast spin is because of the low friction between the coins. 

This work is supported by IUCAA (www.iucaa.in) and TATA Trust (www.tata.com/aboutus/sub_index/Tata-trusts)

Credits:,Ashok Rupner, Manish Jain, Pradnya Pujari, Shivaji Mane, Jyoti Hiremath, Arvind Gupta, Vidula Mhaiskar TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org