Metal and Non Metals
http://www.scribd.com/doc/19236599/Metal-and-Non-Metals
Sunday, August 30, 2009
Friday, August 14, 2009
Student corner
Dear Students
This corner is for you all. You all can leave comments and discuss on certain topics of your choice based on science. It would be nice to see you all ,innovating new experience. Any one who wants to see his /her content on this blog like powerpoint , can submit it to me and I would upload it by your name, But the content should be in relevance to science only.
lets all join hands and experience all together , a new world
Wednesday, August 5, 2009
Magnetic Pick Up
YOU WILL NEED
A piece of paper
A paper clip
Thread
Clear tape
Scissors
A strong magnet
HERE'S HOW
Cut a paper kite shape about three inches long and attach a paper clip to one corner. To the opposite corner, tape a piece of thread about eight inches long. Tape the other end of the thread to a flat surface. Use a strong magnet to pick up the paper clip and extend the string to full length. Hold the kite between your fingers and slowly move the magnet away from the paper clip. When you release the kite, it “flies,” unattached to the magnet.
WHY?
Magnets have a magnetic field, an invisible force that attracts some kinds of metal. Metal objects within the magnetic field do not have to touch a magnet to be pulled by magnetism.
Text by NGS Staff
Illustration by David Bamundo
Electromagnetic Circuit
Electromagnetic Circuit (telegraph):
Glue the foam to the cardboard. Stick the tip of the nail into it so that it is upright. Unwrap the large loop of a paper clip so that the short loop remains with a long wire down. Stick this paper clip into the foam so that the short loop is positioned closely above the nail. When the switch is closed the short loop will be attracted to the nail head and a tap will be heard. The paper clip should spring back and tap back each time the switch is closed. This may require some adjusting. Angle the paper clip stem back a bit so the foam can push it back.
Closing the switch will cause current to flow through the coated wire around the nail. The magnetic field associated with the current will be concentrated on the nail and will induce magnetism in the nail. The nail will attract the paper clip above it and a tap will be heard. The taps are controlled by opening and closing the switch.
Glue the foam to the cardboard. Stick the tip of the nail into it so that it is upright. Unwrap the large loop of a paper clip so that the short loop remains with a long wire down. Stick this paper clip into the foam so that the short loop is positioned closely above the nail. When the switch is closed the short loop will be attracted to the nail head and a tap will be heard. The paper clip should spring back and tap back each time the switch is closed. This may require some adjusting. Angle the paper clip stem back a bit so the foam can push it back.
Closing the switch will cause current to flow through the coated wire around the nail. The magnetic field associated with the current will be concentrated on the nail and will induce magnetism in the nail. The nail will attract the paper clip above it and a tap will be heard. The taps are controlled by opening and closing the switch.
Sunday, August 2, 2009
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