Added 12 months ago | 00:01:17 | 1505 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...
Added over 1 year ago | 00:00:47 | 2734 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...
Added over 1 year ago | 00:01:37 | 3111 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...
Added over 1 year ago | 00:00:52 | 3835 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.
Added almost 2 years ago | 00:01:02 | 3151 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 ...
Added almost 2 years ago | 00:01:54 | 3644 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.
Added almost 2 years ago | 00:01:36 | 3999 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...
Added 2 years ago | 00:01:38 | 5081 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 ...
Added 2 years ago | 00:02:22 | 8190 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....
Added over 2 years ago | 00:03:27 | 9325 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...
Added over 2 years ago | 00:02:23 | 6783 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...
Added over 2 years ago | 00:01:54 | 6897 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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