Coulomb’s Law Electrostatic Force.

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Presentation transcript:

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. Electrons have a negative charge, Protons a positive charge. The amount of charge on either particle is called the Elementary Charge.

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

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.

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

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

Coulomb’s Law Formula:

Coulomb’s Law Formula: Charge on object 1

Coulomb’s Law Formula: Charge on object 2

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

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

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

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?