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Videos tagged with 8.02 (26)

DC Motor

DC Motor

MIT Department of Physics Technical Services Group

Added 1 year ago | 00:01:17 | 1683 views

A DC current is sent around a wire loop that is free to rotate. The current causes the loop to feel a torque in the presence of a magnetic field. Switching the current when the loop flips over allows it to continue accelerating, demonstr...

Bimetallic Strip

Bimetallic Strip

MIT Department of Physics Technical Services Group

Added over 1 year ago | 00:00:47 | 2820 views

A bimetallic strip (12" ) of iron and aluminum is vertically fixed at one end to a board. The top end has a pointer that is free to move. The bimetallic strip is straight at room temperature. When heated with a blow torch, the strip curv...

Magnetizing and Demagnetizing an Iron Rod

Magnetizing and Demagnetizing an Ir...

MIT Department of Physics Technical Services Group

Added over 1 year ago | 00:01:37 | 3188 views

An iron bar is used to try to pick up some paperclips or thumbtacks. It is not able to do this because it is not magnetized. The rod is placed in a long solenoid and DC power applied. The rod becomes magnetized and is able to pick up som...

Collapsing Solenoid

Collapsing Solenoid

MIT Department of Physics Technical Services Group

Added over 1 year ago | 00:00:52 | 3934 views

A slinky is stretched out on a glass rod and connected to 120 VAC. When power is applied, the slinky immediately collapses due to Lenz's Law.

Barkhausen Effect

Barkhausen Effect

MIT Department of Physics Technical Services Group

Added almost 2 years ago | 00:01:02 | 3254 views

A soft iron core is placed inside a solenoid having several hundred turns of fine wire. The coil winding is connected to a loudspeaker. Audible results of the Barkhausen Effect are produced by slowly moving a permanent magnet toward the ...

Simulation of Magnetic Domains

Simulation of Magnetic Domains

MIT Department of Physics Technical Services Group

Added almost 2 years ago | 00:01:54 | 3737 views

A large number of compass needles are mounted on a Plexiglass sheet. A bar magnet is used to set the needles in motion. When the needles come to a stop, interaction between the needles simulates magnetic domains.

Surface Distribution of Charge

Surface Distribution of Charge

MIT Department of Physics Technical Services Group

Added 2 years ago | 00:01:36 | 4120 views

A tear drop shaped conductor on an insulating stand is charged. Charge is scooped up from various points on the surface of the conductor with a proof plane and transferred to an electroscope. It is demonstrated that the charge density is...

Lenz's Law with Copper Pipe

Lenz's Law with Copper Pipe

MIT Department of Physics Technical Services Group

Added 2 years ago | 00:01:38 | 5269 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 ...

Paramagnetism Of Liquid Oxygen

Paramagnetism Of Liquid Oxygen

MIT Department of Physics Technical Services Group

Added over 2 years ago | 00:02:22 | 8284 views

First, liquid oxygen is made by passing gaseous oxygen through a tube submerged in liquid nitrogen. Then the oxygen is poured between the poles of a strong electro magnet. The paramagnetic nature of the oxygen causes an induced dipole....

Ring Falling in a Magnetic Field

Ring Falling in a Magnetic Field

MIT Department of Physics Technical Services Group

Added over 2 years ago | 00:03:27 | 9468 views

Three aluminium objects are dropped through a magnetic field. The objects move slower entering and leaving the field due to changes in the flux through the object. The change in the flux through a conductor results in a force which opp...

Field of a Sphere and an Infinite Plane

Field of a Sphere and an Infinite P...

MIT Department of Physics Technical Services Group

Added over 2 years ago | 00:02:23 | 6867 views

A Mylar balloon is held near a charged Van de Graaff generator. The balloon is moved radially away from the sphere and its deflection from the vertical is observed to decrease with distance. The same procedure is done with a conducting...

Charge and Electric Field of a Hollow Conductor

Charge and Electric Field of a Holl...

MIT Department of Physics Technical Services Group

Added over 2 years ago | 00:01:54 | 7098 views

A conducting sphere is charged with a Wimshurst Machine. Charge is removed from the outside of the sphere and placed on an electroscope, which deflects outwards. When the procedure is done for the inside of the sphere, it is found that...

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