A solid copper pendulum is mounted between the poles of an electromagnet (solenoid). The pendulum is set into motion, and then the magnets are turned on. The magnets induce eddy currents in the copper which oppose the motion of the pendulum. The pendulum quickly slows to a stop, demonstrating an effect called eddy current braking. Eddy current brakes are widely used i
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A solid copper pendulum is mounted between the poles of an electromagnet (solenoid). The pendulum is set into motion, and then the magnets are turned on. The magnets induce eddy currents in the copper which oppose the motion of the pendulum. The pendulum quickly slows to a stop, demonst
more ...
submitted by Suraj (629 m) on 15 Jul 2010 14:35:11 IST (43 views)
A variable capacitor (C), large inductor or solenoid (L), and 200W light bulb (R) are connected in series to 120 VAC. The inductance of the inductor can be varied by inserting an iron core, and the capacitance can be varied by a row of switches. By varying the inductance and capacitance, we can achieve the resonance of the circuit, where maximum current flows through the resistor (light bulb).
See the original post on MIT TechTV - http://techtv.mit.edu/videos/771
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submitted by Suraj (629 m) on 15 Jul 2010 14:31:43 IST (31 views)
One wire coil is connected to a radio, and another is connected to a speaker. The two coils are not connected to each other. The radio signal is transmitted through the induced magnetic field caused by the current in the wires. The signal is only received when there is a magnetic flux through the receiving coil, and thus no sound is heard when the coils are perpendicular to each other.
See the original video and more on MIT TechTV - http://techtv.mit.edu/videos/782
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submitted by Suraj (629 m) on 15 Jul 2010 14:30:36 IST (19 views)
A solid copper pendulum is mounted between the poles of an electromagnet (solenoid). The pendulum is set into motion, and then the magnets are turned on. The magnets induce eddy currents in the copper which oppose the motion of the pendulum. The pendulum quickly slows to a stop, demonstrating an effect called eddy current braking. Eddy current brakes are widely used i
...More
A solid copper pendulum is mounted between the poles of an electromagnet (solenoid). The pendulum is set into motion, and then the magnets are turned on. The magnets induce eddy currents in the copper which oppose the motion of the pendulum. The pendulum quickly slows to a stop, demonst
more ...
submitted by Suraj (629 m) on 15 Jul 2010 14:29:48 IST (17 views)
Two flexible wires are suspended vertically. The wires are conected in series or parallel to a 12V storage battery. When the wires are connected in series and power is applied they will repel each other; when they are connected in parallel they weill attract one another.
This effect is due to the magnetic fields created by the charge flowing through the wires. When the wires are in parallel, the currents in each are going in the same direction and thus attract. In series the currents are going in opposite directions and repel.
See original video on MIT TechTV - http://techtv.mit.edu/videos/823
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submitted by Suraj (629 m) on 15 Jul 2010 14:28:17 IST (24 views)
Two flexible wires are suspended vertically. The wires are conected in series or parallel to a 12V storage battery. When the wires are connected in series and power is applied they will repel each other; when they are connected in parallel they weill attract one another.
This effect is due to the magnetic fields created by the charge flowing through the wires. When the wires are in parallel, the currents in each are going in the same direction and thus attract. In series the cur
...More
Two flexible wires are suspended vertically. The wires are conected in series or parallel to a 12V storage battery. When the wires are connected in series and power is applie
more ...
submitted by Suraj (629 m) on 15 Jul 2010 14:27:48 IST (24 views)
A long length of wire is suspended horizontally between the poles of a magnetron magnet. When a large current from a 12V storage battery is passed through the wire, the wire jumps out of the magnetic field. When the direction of the current is switched, the wire jumps the opposite direction.
The magnetron magnet in this demonstration was originally used in MIT's groundbreaking research developing radar during and after World War II. Microwave emitting cavity magnetrons need strong magnetic fields, which were often created by powerful permanent magnets like the one used in this demo.
See original video on MIT TechTV - http://techtv.mit.edu/videos/843
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submitted by Suraj (629 m) on 15 Jul 2010 14:27:15 IST (17 views)
A wooden ball is attached to the rim of a spinning wheel. The ball is held in place by a string. When the spring is cut, the ball flies in a straight tangent to the wheel.
In the camera's frame of reference, the ball constantly accelerates around in a circle due to the centripetal force pulling it inwards. When the string is cut, the acceleration stops, and the ball flies away in a straight tangential line. When the string is cut in the rotating frame of reference, a ficticious force (centrifugal force) accelerates the ball.
See the original video on MIT TechTV - http://techtv.mit.edu/videos/740-mit-physics-demo----centrifugal-versus-centripetal-motion
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submitted by Suraj (629 m) on 15 Jul 2010 14:26:57 IST (18 views)
Two people on carts pull on a long rope, demonstrating that the center of mass does not move.
See the original video on MIT TechTV - http://techtv.mit.edu/videos/850-mit-physics-demo----no-win-tug-of-war
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submitted by Suraj (629 m) on 15 Jul 2010 14:26:21 IST (18 views)
A bicycle wheel is suspended from one of end of its axie by a rope, and spun up by hand. The wheel's axle is then placed horizontally and the free end of the axle processes about the supported end.
The gyroscope seems to defy gravity because the torque created by the spinning wheel counteracts the torque due to gravity. Gyroscopes have been used through history for varied uses such as stabilizing spacecraft or for guidance systems on ships and missiles.
See the original video on MIT TechTV - http://techtv.mit.edu/videos/717-mit-physics-demo----bicycle-wheel-gyroscope
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submitted by Suraj (629 m) on 15 Jul 2010 14:26:03 IST (17 views)
A string carrying two weights is hung over a low friction bearing mounted pulley. The weights have slightly different masses, causing a uniform acceleration. When the time it takes the weights to move 1 meter is timed, we can calculate the acceleration of the system due to gravity. Because of the low amount of friction in the system, this value is very close to the theoretical value.
See the original posting on MIT TechTV - http://techtv.mit.edu/videos/818-mit-physics-demo----low-friction-atwood-machine
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submitted by Suraj (629 m) on 15 Jul 2010 14:25:40 IST (18 views)
