- Sections
- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
- K. Electromagnetic Principles
- L. Geometrical Optics
- M. Wave Optics
- N. Spectra & Color
- O. Vision
- P. Modern Physics
J4-12. Electrostatic Force - Moving Lumber
Purpose
To demonstrate polarization of water molecules.
Equipment
Eight foot long wooden 2x4 on low-friction pivot, charging materials.
Images
Description
An eight-foot long pine 2x4 is balanced on a relatively friction-free support, so that it can rotate about the balance point. A rod charged by "friction" (either positive or negative) is held alongside either end of the 2x4. A force is exerted on the 2x4 and it rotates toward the rod, so that you can pull the 2x4 around with the rod. Changing to the other polarity rod creates the same force, and again the 2x4 can be pulled around by the rod. The non-uniform field of the rod lines up the polar water molecules in the wood and exerts an attractive force on them.
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See pagesj1. electrostatic charge & force
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See pagesj3. electric fields & potential
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See pagesj4. capacitance & polarization
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See pagesj5. magnetostatics
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See pagesj6. electromagnets
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See pagesj7. magnetic materials
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See pagesj1. electrostatic charge & force
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See pagesj3. electric fields & potential
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See pagesj4. capacitance & polarization
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See pagesj5. magnetostatics
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See pagesj6. electromagnets
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See pagesj7. magnetic materials