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What is the magnetic field?
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The Tabletop Explainer is an intermittent educational vlog presenting answers to viewer questions, brief science lessons, and ideas for teachers and students. It is a feature of my blog "Tilts at Windmils" which can be found at http://www.davidcolarusso.com/blog/
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submitted by ranjodhbedi BEDI (636 m) on 24 Sep 2010 16:49:11 IST )
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Wheatstone Bridge
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Check us out at http://www.tutorvista.com//videos
A Wheatstone bridge is a measuring instrument invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843 . It is used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. Its operation is similar to the original potentiometer. Rx is the unknown resistance to be measured; R1, R2 and R3 are resistors of known resistance and the resistance of R2 is adjustable. If the ratio of the two resistances in the known leg (R2 / R1) is equal to the ratio of the two in the unknown leg (Rx / R3), then the
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submitted by ranjodhbedi BEDI (636 m) on 24 Sep 2010 16:46:02 IST )
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Surfing a standing wave on the North shore
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Today we went to Waimea beach and got to watch something cool. The beach sits at the base of a valley which has a small stream running through it. Due to wave action, sand gets pushed up into a large hill in front of the stream each winter. This creates a natural dam that the stream water collects behind for months which is about 20 feet above the level of the ocean on the other side of the sand berm. Every year some one digs a trench through the sand releasing millions of gallons of fresh water into the ocean. This produces a standing wave which is perfect for body boarding and surfing on. When we first walked up these kids had just a trickle of water moving throug
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submitted by ranjodhbedi BEDI (636 m) on 24 Sep 2010 16:36:00 IST )
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Young's Double Slit Experiment
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This shows Thomas Young's double slit experiment using a laser pen and a couple of pencil leads. When light shines through two slits between the leads, the two waves coming out interfere and the result is shown on the wall. Interference also occurs with one slit, because light wavelets from each side of the slit interfere with each other. The difference is that with two slits, there is an amplitude envolope not seen with a single slit. However, this is not seen in this video.
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submitted by ranjodhbedi BEDI (636 m) on 24 Sep 2010 15:49:39 IST )
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