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A 100 uF oil-filled capacitor is charged to 3 KV. This takes approximately 15 minutes to charge, creating a charge on the capacitor that could be lethal. The capacitor is then discharged through a 12" length of 30 gauge bare iron wire.When the high voltage current flows through though high resistance wire, the bonds between iron molecules are shattered, resulting in a loud bang, a shower of sparks, and a cascade of wispy filaments floating through the air.Not all of the charge on the capacitor is disharged through the wire, so a shorting bar must be used to release the remaining charge.

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 coil causes it to rotate in opposite directions.This principle is used by devices called galvanometers to measure electric current.

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.

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 the disk. With the disk spinning, these eddy currents form to oppose the magnetic field of the magnet, making it levitate. When the motor is turned off, the magnet falls back to the disk.

A light bulb is placed in series with two copper plates immersed in de-ionized water. Touching the plates closes the circuit, lighting the bulb.When kosher salt is dropped into the de-ionized water, the salt dissolves, causing ions to be dispersed throughout the liquid. The free ions allow current to flow through the water, which completes the circuit and lights the bulb.Most water we encounter in everyday life is not de-ionized and contains impurities with dissolved ions. This is why we know water as a good conductor, and why we shouldn't use electronic devices around a bathtub, for example.

A small glass tube, held by copper wire, is placed in series with a light bulb. The glass acts as an insulator at room temperature, meaning the current cannot flow between the copper wires. This leaves an open circuit and the light bulb does not light up. Touching a conductor across the copper wires (with a metal screwdriver for instance) does complete the circuit because it allows current to flow.However, when glass is sufficiently heated by a torch it becomes an ionic conductor. Ionic bonds in the glass are broken, allowing the charge carrying ions to move freely. Thus, when the glass is melted the current can flow, which closes the circuit and lights the bulb.

Author: xflash Added: Fri, 06 Jun 2008 09:52:41 -0800 Duration: 67Video Praktikum Fisika - Repulsi Elektromagnetik. Disusun oleh : kelompok 4 1. Andri R 2. Cintya O 3. Dwi M 4. Selfi C 5. Triana M xi ipa 1 sman 1 ciamis

An RF transmitter is connected to a long antenna, emitting radio waves. A dipole antenna with a light bulb between its elements acts as the receiver. When the receiving antenna is parallel to the transmitter, the radio waves are absorbed, creating a current in the antenna and causing the bulb to glow. When perpendicular, no current is created, and the bulb does not glow.

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A polarized microwave emitter and a polarized microwave receiver face each other on a table. At first, the emitter and receiver are polarized in the same direction (up-down), and all the emitted signal gets received. When a metal comb in inserted between them, with the teeth pointed down, the signal is blocked. This is because the microwaves are polarized in the same direction that the teeth are pointing, creating small currents in the metal that reflect the microwaves backwards. When the comb teeth are turned horizontally, the signal passes through undisturbed.When the receiver is turned 90 degrees, no signal is received. However, when the comb is inserted at a 45 degree angle, some signal passes through. This is because light waves are made up of two perpendicular components that add up to form the polarization of the wave. When one component is knocked out, the wave changes polarization. Read more about polarizers here.

A double-horn microwave emitter faces a microwave receiver. The receiver is also connected to a speaker, which displays the received signal as audio, and an oscilloscope, which displays the signal visually. When the receiver is moved perpendicularly to the emitter, constructive and destructive interference can be both seen and heard.When one of the emitter horns is covered, the interference pattern disappears.

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 in trains and roller coasters.When a copper pendulum with strips cut into it is swung between the same magnets, it is not slowed nearly as much as the solid pendulum. This is because the cuts in the copper prevent large eddy currents from forming. Only eddy currents smaller than the strips of copper can be formed.

Exam 2 Review: Part 1/11 Professor Gabriella Sciolla, Physics Solenoid, current, magnetic field, Amperian loop, Ampere's law -------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 2/11 Professor Gabriella Sciolla Charge, electric field, symmetry, Gauss's law, flux ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 3/11 Professor Gabriella Sciolla, Physics Moving charges, current, velocity, magnitude and direction of magnetic field ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 4/11 Professor Gabriella Sciolla, Physics Ampere's law, Amperian loop, symmetry, magnetic field, enclosed current ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 5/11 Professor Gabriella Sciolla, Physics Current in cylindrical shell, current density, regions, Ampere's law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 6/11 Professor Gabriella Sciolla, Physics Infinite wire, round loop, direction of magnetic field, Biot-Savart law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 7/11 Professor Gabriella Sciolla, Physics Rotating loop, angular velocity, magnetic field, flux, emf, Faraday's law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 8/11 Professor Gabriella Sciolla, Physics External magnetic field, emf, flux, magnitude and direction of current ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 9/11 Professor Gabriella Sciolla, Physics Magnetic field, constant flux, increasing current, induced emf ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 10/11 Professor Gabriella Sciolla, Physics Magnetic field, Ampere's law, magnetic forces, force directions ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

Exam 2 Review: Part 11/11 Professor Gabriella Sciolla, Physics Magnetic forces, magnitude and direction ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 3: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla, Physics Moving charges, current, velocity, magnitude and direction of magnetic field ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 4: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla, Physics Ampere's law, Amperian loop, symmetry, magnetic field, enclosed current ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 9: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla, Physics Magnetic field, constant flux, increasing current, induced emf ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 6: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla, Physics Infinite wire, round loop, direction of magnetic field, Biot-Savart law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 10: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla, Physics Magnetic field, Ampere's law, magnetic forces, force directions ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 2: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla Charge, electric field, symmetry, Gauss's law, flux ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.

PART 7: 8.02 Review 13 Nov 2007 Professor Gabriella Sciolla, Physics Rotating loop, angular velocity, magnetic field, flux, emf, Faraday's law ------------------------------------------------------------- Video: K. Baldauf, V. Ivanova, K. Mclaughlan Play video in Quicktime format for best quality.