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The lighthouse generator is an amazing scientific model. For making this your require Neodymium
magnets, 35-gauge insulated copper wire, old CD, and a lot of other material. Take 35-gauge
insulated copper wire and wind 1000 turns on an old film can. Remove the coil and place
a pen inside the coil. Make a hole in the pen and remove the two ends of the wire through
the pen. Scrape the two ends of insulation and attach an LED to the ends of the coil.
Now you can see that the pen is inside the coil and the two ends go through the pen and
are attached to the LED. Fix the LED to the end of the pen. This is the complete coil
and the rotating pen. If you spin two strong magnets near the coil, EMF will be generated
and the LED would light up. Now take an old CD and cut three parts. You require two rectangular
strips and a square portion with the hole in the middle. Fix with glue the lid of a
film can to the square. Take a press button and fix the part with the trough in the middle
of a wooden base. Stand four wooden pillars as shown. Apply glue on the top of these pillars
and fix the square CD piece on them. It is through the hole in the middle that the pen
will come out. These are 4 strong Neodymium magnets. Stick 2 magnets back-to-back on a
piece of rectangular plastic CD. Make two such strips with two-two magnets each and
glue them on to the pillars as shown. This is the final foundation of the Lighthouse
generator. Now slip in the pen that the tip of the pen sits in the press button. Ensure
that the pen spins smoothly. This is the view of the Lighthouse generator from all sides.
On spinning the pen the coil will spin inside the magnets and the LED will light up! You
can see this much better in the dark. If you spin the pen the coil spins between the magnets
and an EMF is generated and the LED lights up. This is a variation. Instead of a wooden
base you can have a piece of rubber and you can have 4 pencils. Once you spin the pen
the coil rotates inside the magnets and the LED lights up just like a Light House.