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Electrostatics

Electrostatics. Seo Physics. Objective. To mathematically observe charges in atoms To find the Electrostatic Force between two different charges. Electric Charge. What is an Electric Charge? Atomic forms of matter 2 main charges: Proton (+) Positive Charge

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Electrostatics

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  1. Electrostatics Seo Physics

  2. Objective • To mathematically observe charges in atoms • To find the Electrostatic Force between two different charges

  3. Electric Charge • What is an Electric Charge? • Atomic forms of matter • 2 main charges: • Proton (+) Positive Charge • Electron (-) Negative Charge • Units? • Coulombs (C) • Numerical Value? • Proton = +1.6 x 10-19 C • Electron = -1.6 x 10-19 C • 2 Interactions • LIKE(aka. Same) Charges = Repel • UNLIKE(aka. Different) Charges = Attract

  4. Coulombs Law • What is Coulombs Law? • Magnitude or the Electric Force of two charges in an object(s) or atom(s) • Equation? • F = Force or Magnitude , q1= Charge of object 1 q2= Charge of object 2 , r = Radius, k= Coulombs constant , () – Absolute Value- makes all numbers positive • Value of k? 9 x 109 Nm2/c2

  5. Important Multipliers

  6. practice • Two 0.5 kg spheres are placed 25 cm apart. Each sphere has a charge of 100 μC. • A ) Calculate the electrostatic force between them. B) Write their sign charge • Two Spheres REPEL, because both charges are (+)

  7. DIY • Two charges, Q1= +8 µC and Q2= -5 µC, are separated by a distance r= 10 cm • A) Find the Magnitude between two charges and B) Does it Repel or Attract? • Q1= +8 µC  +8×10-6 C • Q2= -5 µC  -5×10-6 C • Attracts (+) and (-)

  8. Electric Field E= Electric Field (N/C) k= Coulombs Constant (9 x 109 Nm2/c2) q1 = Charge of object 1 r = radius or distance • What is an Electric Field? (E) • A directional field force around positive or negative charges • Units? • N / C • Equation?

  9. Practice • What is the magnitude and direction of the electric field 0.25 meters away from a point charge, q1, with 5.0 µC • q1 = 5 µC  5×10-6 C

  10. DIY • What is the magnitude and direction of the electric field 0.75 meters away from a point charge, q1, with +3.7 nC • q1 = +3.7 nC  +3.7×10-9 C

  11. Field Directions • Positive charge • Points AWAY from the charge • Negative charge • Points TOWARD from the charge

  12. Electric Field ex 1

  13. Electric Field Ex 2

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