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Presentation transcript:

Please come to the front of the lecture hall to see the demonstrations.

Please be Seated

from Lecture-Demonstration Now on a two-DVD set: The classic four-hour video collection: Demonstrations in Acoustics for only $20. $10 discount for direct cash sales. Inquire in front after program. Dr. Richard E. Berg, demonstrating over 70 experiments, in 29 titled segments, covering vibrations, waves and sound.

Physics is Phun list Go to the Physics is Phun web site and click on “mailing list” link near top of page

Link to: SUMMER AND OTHER PROGRAMS FPR PRE-COLLEGE STUDENTS SUMMER AND OTHER PROGRAMS FPR PRE-COLLEGE STUDENTS

Electricity and Magnetism Physics is Phun January 2009

Topics: Electrostatics Magnetostatics Laws of Electromagnetism

Electrostatics

Pity the poor neutron; he thought he was a proton but he wasn’t positive.

Siphon Quantum mechanical tunneling “Triboelectricity”

Charging by Induction

Polarization in the Atom Electric forces on polar molecule Polar and Non-Polar LiquidsPolar and Non-Polar Liquids (a) and (b)(a) (b) Electrostatic Force – Moving Lumber

Van de Graaff electrostatic generator: simulates lightning from cloud to ground

Lightning (1)

Lightning (2)

Lightning (3)

Lightning (4)

Lightning (5)

Lightning (6)

Lightning Video Lightning Video compliments of Tom A. Warner, ztresearch.com 640x480 pixels 7,200 images per second 0.15 seconds recording time Visual aspects: -stepped leaders -dart leaders -return strokes -continuing current

Lightning Rod Simulator Lightning striking the Empire State Building

Magnetostatics

Lodestone

Magnet and Magnetic Field

Broken Magnet

Relations between electricity and magnetism

Ampere’s Law: Electric currents create magnetic fields.

Lorentz Force: Charges moving in a magnetic field experience an electromagnetic force.

Faraday’s Law of Induction: A changing magnetic field creates an electric field.

Lenz’s Law: Induced electric currents act so as to oppose the motion that caused them.

Magnets dropped through tube

Magnetic Levitation

Train Levitation Magnetic Levitation Trains Photographs compliments of: High Speed Rail (HSR), by Oliver Keating Yamanashi test line Maglev site in Japan

Maglev Train “Tracks” Train moving on Guideway at 500 mph The Yamanashi Guideway for the MLX01

Electromagnetic Can Crusher Video showing explanation a. current from capacitor creates magnetic field b. increasing magnetic field induces electric field c. electric field moves electrons around can d. electrons feel inward and separation forces e. can cut in two and pushed apart Slow motion of can crusher at Weslyan University Compliments of Vacek Miglus

Cyclotron Dee discharge

Cyclotron ion source

We are on the web at Animated Gifs compliments of bellsnwhistles.com The End See you in March!