5H10.30 – Magnet and Iron fillings
This demonstration shows the magnetic field around a magnet using iron filings.
Electricity and Magnetism
5H10.20 – Oersted’s effect
This experiment demonstrates how a flowing current through a wire generates a magnetic field by putting a needle next to it.
5C10.20 – Sliding capacitors
This demonstration illustrates how capacitors work under various conditions and parameters.
5B20.30 – Faraday’s cage – electroscope
With this demonstration we can better visualize how the faraday’s cage works and why it works.
5D20.10 – Temperature Dependence of Resistance
This demonstration illustrates the temperature dependence of resistance. The effect is caused by the fact that the electrons moving through the wire collide with vibrations (phonons) created in the material by thermal noise. At lower temperatures this will happen less, and thus the resistance goes down. In semiconductors and insulators an opposite effect occurs, where resistance decreases with temperature due to the lowering of the Fermi level, and thus less electrons being in the conduction band.
5K20.30 – Lenz’s Law – Jumping Rings
This demonstration illustrates Lenz’s law, as the EMF induced in the ring counteracts the magnetic field from the electromagnet, and ejects it upwards.
5K20.25 – Waltenhofen Pendulum
This demonstration illustrates magnetic braking via Eddy currents as the pendulum is stopped when the circuit is completed.
5A40.16 – Charging Electroscope by Induction
This demonstration illustrates how an electroscope can be charged using electrostatic charges generated via friction.
6H30.10 – Polarizers
The two polarizer setup filters vertically and horizontally, so no light gets through. By adding a third one one in between, a superposition of vertical and horizontal polarization is induced in the light from the first polarizer, thus some light can pass through the third one. Also known as the Dirac three polarizer experiment
5E50.15 – Thermo-Electric Converter
This demonstration demonstrates the Thermo-Electric effect and the conversion from heat energy into electrical energy and then into mechanical energy. It also demonstrates “useful energy”: the total heat energy is approximately the same in both scenarios, but only in the first one can we actually extract work from it
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