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THE SCIENCE CLUBKIDS' SCIENCE PROJECTS SCIENCE PROJECTS: MEDIUM-DIFFICULT

• Also: SURPLUS OPTICS, and MAIL-ORDER JUNK
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• THE AMATEUR SCIENTIST magazine articles

• Simple kid-lifting hovercraft
• NEODYMIUM SUPERMAGNET demonstration ideas also MORE
• Negative Ion Generator as safe high-volt supply
• ELECTROSTATIC GENERATOR, "Kelvin's thunderstorm"
• Add controlled high voltage to your VandeGraaff

• Doorknob Sparks
• Ridiculously Simple Charge Detector
• Ultra-simple electric generator, vid and instructions
• Drawing holograms by hand!!!
• Build a VandeGraaff Generator, or buy one,
• ...or just perform tricks with a table-top VDG

• Electrostatic, Hi Volt projects , also defeating humidity
• $2.00 Tiny Tesla Coil
• Gigantic low-cost solar furnace
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• TOUCH THE CLOUDS device

• Plasma Globe uses clear light bulb
• SODA-BOTTLE ELECTROSTATIC MOTOR, also some design tricks
• Explaining electricity with colored plastic sheets.
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• The DisgustoScope

• Making the Lemon Battery work
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• Why is Science so difficult to learn?
• The secret to understanding Electricity

• MORE: advanced projects

best videos in the world

If you are not familiar with TED Talks, you need to come out of your cave. I can’t stop watching them.  Life got busy and I guess I forgot about filling my brain with a little bit of inspiration.  I was recently reminded of the TED Talks by Kaitlyn.  She sent me a link to her blog with 15 physics talks.  You can find her blog post here:http://www.onlineuniversities.com/15-fascinating-ted-talks-for-physics-students/.
When you are there, make sure you take a look at this talk by Dean Kamen.  necessary for engineering and robotics students tomorrow.  My hope is they see the importance of what they are doing.

SPM Physics Form 5 - Electromagnetism

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Showing posts with label catapult field interaction of 2 magnetic field.Show all posts

Force on a Current Carrying Conductor in a Magnetic Field

Posted by Electromagnetism | 8:18 PM | catapult field interaction of 2 magnetic field |0 comments »

When a current-carrying conductor is placed in a magnetic field, the interaction between the two magnetic fields will produce a force on the conductor, which called a catapult force.

The direction of the force can be determined by Fleming's left hand rule as shown in Figure below.

The fore finger, middle finger and the thumb are perpendicularly to each other. The forefinger points along the direction of the magnetic field, middle finger points in the current direction and the thumb points along the direction of the force.

The strength of the force can be increased by:

1. Increase the current
2. Using a stronger magnet

The Catapult Field
The interaction of the two magnetic fields produces a resultant field known as catapult field as shown in the figure below.


Physics Animation
Applet
Lorentz Force

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Table of Content

·         1.1 Revision - Magnetism

·         2.1 Electromagnet

·         2.2 Straight Wire

·         2.3 Flat Coil

·         2.4 Solenoid

·         2.5 Apllication - Electric Bell

·         2.6 Application - Electromagnetic Relay

·         2.7 Application - Circuit Breaker

·         2.8 Application - Telephone Earpiece

·         3.1 Force on a Current Carrying Conductor

·         3.2 Force between 2 Current Carrying Conductor

·         3.3 Turning Effect of a Coil in a Magnetic Field

·         3.4 Direct Current Motor

·         3.5 Application - Moving Coil Meter

·         4.1 Electromagnetic Induction

·         4.2 Lenz's Law and Faraday's Law

·         4.3 DC Generator

·         4.4 AC Generator

·         4.5 Alternating Current

·         5.1 Transformer

·         5.2 Factors Affect the Efficeincy of a Transformer

·         6.1 Generation of Electricity

·         6.2 Transmission of Electricity

·         6.3 National Grid Network

Glossary

·         alternating current (1)

·         catapult field (1)

·         catapult field interaction of 2 magnetic field (1)

·         coil (1)

·         efficiency (2)

·         electric bell (1)

·         electricity generation (1)

·         electricity transmission (1)

·         electromagnet (1)

·         Faraday's Law (1)

·         Fleming's Right Hand Rule (1)

·         generator (2)

·         Lenz's Law (1)

·         magnetic field (1)

·         Magnetism (1)

·         microphone (1)

·         motor (1)

·         National Grid Network (1)

·         solenoid (1)

·         transformer (2)

·         turning effect (1)

http://physics503.one-school.net/2008/06/uses-of-electromagnet-electric-bell.html
http://www.youtube.com/watch?v=2Y80QG-F7Fs&feature=player_embedded

Uses of Electromagnet - Electric Bell

Posted by Electromagnetism | 8:15 PM | electric bell | 0 comments »

When the switch is on, the circuit is completed and current flows. The electromagnet becomes magnetised and hence attracts the soft-iron armature and at the same time pull the hammer to strike the gong. This enables the hammer to strike the gong.

As soon as the hammer moves towards the gong, the circuit is broken. The current stops flowing and the electromagnet loses its magnetism. This causes the spring to pull back the armature and reconnect the circuit again.

When the circuit is connected, the electromagnet regain its magnetism and pull the armature and hence the hammer to strike the gong again. This cycle repeats and the bell rings continuously.

Physics Animation
Applet
Simple Buzzer

http://physics503.one-school.net/2008/06/uses-of-electromagnet-electric-bell.html
http://www.youtube.com/watch?v=2Y80QG-F7Fs&feature=player_embedded