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Videos tagged with magnet (11)

Lenz's Law with Copper Pipe

Lenz's Law with Copper Pipe

MIT Department of Physics Technical Services Group

Added over 2 years ago | 00:01:38 | 6006 views

A magnet is dropped down a conducting copper pipe and feels a resistive force.  The falling magent induces a current in the copper pipe and, by Lenz's Law, the current creates a magnetic field that opposes the changing field of the ...

MIT Physics Demo -- Magnetic Deflection of a TV Image

MIT Physics Demo -- Magnetic Deflec...

MIT Department of Physics Technical Services Group

Added 6 years ago | 00:01:35 | 53411 views

An cathode ray tube (CRT) television is connected to a video camera. When a strong magnet is brought close to the television screen, the image becomes warped and discolored.While many new televisions use flat screen technology, older C...

MIT Physics Demo -- Galvanometer Principle

MIT Physics Demo -- Galvanometer Pr...

MIT Department of Physics Technical Services Group

Added 6 years ago | 00:00:47 | 48632 views

Two large coils of wire ("Helmoholz coils") are connected to 125V DC power, and produce a uniform magnetic field between the coils. A separate coil is suspended with this field. Switching the polarity of the DC current in the inner co...

MIT Physics Demo -- Jumping Wire

MIT Physics Demo -- Jumping Wire

MIT Department of Physics Technical Services Group

Added 6 years ago | 00:00:37 | 34660 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 cur...

MIT Physics Demo -- Forces on a Current-Carrying Wire

MIT Physics Demo -- Forces on a Cur...

MIT Department of Physics Technical Services Group

Added 6 years ago | 00:00:49 | 38162 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 par...

MIT Physics Demo -- Levitating Magnet

MIT Physics Demo -- Levitating Magnet

MIT Department of Physics Technical Services Group

Added 6 years ago | 00:00:47 | 40446 views

A magnet with a very strong magnetic field is held in place on an aluminum disk. The disk is attached to a motor powered by variable AC current. When the disk rotates, the magnet will levitate above it due to eddy currents generated in ...

MIT Physics Demo -- Pendulum and Magnet

MIT Physics Demo -- Pendulum and Ma...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:11 | 40217 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 pe...

MIT Physics Demo -- Jacob's Ladder and the Melting Nail

MIT Physics Demo -- Jacob's Ladder ...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:01:26 | 47869 views

A solenoid is connected to AC power. First, a 10,000-turn coil is placed over the solenoid, but is not connected to the power source. However, the solenoid still induces current in coil, creating very high voltages because of the high...

MIT Physics Demo -- Back "emf" in a Large Solenoid

MIT Physics Demo -- Back "emf" in a...

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:23 | 62988 views

A large solenoid is connected to DC power through a knife switch. When the switch is closed, the current builds up to approximately 30 amps. When the switch is opened, the solenoid attempts to keep the current flowing, creating a huge...

Physics Demo -- Lenz's Law

Physics Demo -- Lenz's Law

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:29 | 47720 views

Two bar magnets of the same size are dropped through an aluminum tube and a glass tube. The magnet dropped in the glass tube falls at the normal rate of acceleration due to gravity, but the magnet falling through the metal tube is slow...

Physics Demo -- Superconductor

Physics Demo -- Superconductor

MIT Department of Physics Technical Services Group

Added over 6 years ago | 00:00:56 | 50612 views

A bismuth-based superconducting disk sits on a copper base and is immersed in liquid nitrogen. Two small, very strong magnets are placed on top of the superconductor. The magnets levitate due to the expelled magnetic field from the supe...