Magnetic Induction with needles | English

By attaching some needles to a small piece of pipe and bringing a magnet close to them, we can demonstrate magnetic induction and the concept of magnetic memory. Lets see how to make this simple magnetoscope.

Six needles are hanging from a pipe using nylon threads. A magnet is brought close to these needles. North Pole of a magnet induces South Pole at the near ends of the needles. On removing the magnet, the needles move away from each other due ti repulsion between like poles. And if you bring the south pole of the magnet close to needles, only a few of them are repelled. Some needles also show attraction as new pole gets induced. These needles are made of soft iron, which show very poor magnetic retention or memory.

This setup containing hanging needles that demonstrate specific behavior in presence of a magnet is also a model for magnetoscpoe, just like gold leaf electroscope.

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Production team: Ashok Rupner, Chaitanya Mungi, Neha Apte, Prof. B. D. Chakradeo, Shraddha Bhurkunde, Mukund Mehendale
Camera: Vivek Kannadi, Kanchan Sharma
Music: Dr. Manasi Kulkarni