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Coulomb’s Law

Coulomb’s Law. Electrostatic Force. Charge Q. Any amount of charge can be denoted by Q or q The unit for charge is the Coulomb (C) . One Coulomb is a HUGE amount of charge. Key Facts. The charge on a proton and an electron are EXACTLY THE SAME MAGNITUDE .

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Coulomb’s Law

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  1. Coulomb’s Law Electrostatic Force

  2. Charge Q • Any amount of charge can be denoted by Q or q • The unit for charge is the Coulomb (C). • One Coulomb is a HUGE amount of charge.

  3. Key Facts • The charge on a proton and an electron are EXACTLY THE SAME MAGNITUDE. • Electrons have a negative charge, Protons a positive charge. • The amount of charge on either particle is called the Elementary Charge.

  4. Elementary Charge • The Elementary Charge is defined as the amount of charge on one electron or one proton. • e= 1.602 x10-19C • qproton= 1.602x10-19C • qelectron= -1.602x10-19C

  5. Finding total charge • To find the total amount of charge contained in 1million electrons, simply multiply q of one electron times 1million. • q = (1,000,000)(-1.602x10-19C)= -1.602x10-13C • Charges (q) always come in multiples of the Elementary Charge.

  6. Charges on Objects • Charge is described at the charge on a single object, NOT how many electrons it has.

  7. Coulomb’s Law • Gives the force between two charged objects at any distance. This is called the Electrostatic Force. • Coulomb’s Constant (kc): kc= 8.99 x 109 N-m2/C2

  8. Coulomb’s Law • Formula:

  9. Coulomb’s Law • Formula: Charge on object 1

  10. Coulomb’s Law • Formula: Charge on object 2

  11. Coulomb’s Law • Formula: Distance between the two objects. Don’t forget to SQUARE IT!

  12. Solving Coulomb’s Law • If Felec is negative, the force is ATTRACTIVE. • If Felec is positive, the force is REPULSIVE.

  13. Electricity and Gravity • Electricity and Gravity are very similar. Compare the equations for Electrostatic Force and Gravitational Force…

  14. Example • A balloon rubbed against denim gains a charge of -8.0 µC (10-6C). What is the electric force between the balloon and the denim when the two are separated by a distance of .05m?

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