ph_12_electrostatics.docx

# ph_12_electrostatics.docx - Physics 12 — Electrostatics 1...

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Physics 12 — Electrostatics 1 — Electrostatic Forces Electric charge is a property of protons (positive) and electrons (negative). An electric charge is due to an excess of protons or electrons. Like electric charges repel and unlike electric charges attract. An electroscope is a simple devise that can detect charges. Example 1: Show how a charged balloon can be attracted to a neutral wall, or how neutral sawdust will attract to a charged object. A charged electroscope can be neutralized by grounding it (earthing). The earth is considered to be able to donate or accept any number of electrons to neutralize any charge. Example 1: How can an object be charged by conduction and by induction? 1

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Physics 12 — Electrostatics The quantitative relationship for the force between two point charges is Coulomb’s Law: F = force (N), Q = charge in coulombs (C), r = distance between point charges (m). k = 9.00 x 10 9 Nm 2 /C 2 Example 3: Find the electrostatic force between two stationary electrons 8.0 µm apart. What is the instantaneous acceleration if one of the electrons is released? What if the distance is increased to 40 µm? 2 — Combining Forces between Multiple Particles Example 1: Three protons are placed on a line at 0 m, 0.40 m, 0.90 m. Find the force on each proton. 2 F e kQ 1 Q 2 r 2
Physics 12 — Electrostatics Example 2: Three 35 µC charges are placed on the corners of an equilateral triangle with sides of 15 cm. What is the force on each charge?

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