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# Conceptual Physics: Coulomb's Law

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## Wesley Szalkowski

on 4 March 2013

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#### Transcript of Conceptual Physics: Coulomb's Law

Coulomb's Law Newton's Law of Gravitation For charged particles or objects that are small compared with the distance between them, the force between the charges varies directly as the product of the charges and inversely as the square of the distance between them. Coulomb's Law What is Newton's Law of Gravitation? Electrical Forces -Can occur in a vacuum

-Electrical forces cancel- most objects have same amount of protons and electrons

-Atoms close together- share electrons
-Closer to nucleus- bonding

-Interaction- non-contact (over distance)
-3 variables- 2 charges and distance

-Distance- affects strength of attraction

-More protons- positive
-More electrons- negative Coulomb Law Breakdown Coulomb's Constant Characteristics What does state? Meaning of Symbols F- Force of electricity (static)

k- Coulomb's Law constant (proportionality constant)

q1- charge of object one

q2- charge of object two

d- distance What does that mean? Coulomb's law shows the relationship between electrical FORCE, CHARGES and DISTANCE States that gravitational force between two objects is proportional to product of mass and inversely proportional to distance Law of Gravitation vs. Coulomb's Law Similarities -Gravitational force- only attracts
-Electrical force- attracts and repels

-Pull between charged atoms stronger than gravitational pull

-G smaller than k -Composition the same Differences -Applies to charges in air
-Size depends on medium- reduced in water

-m and C cancel when solving
-Leaves Newtons (force)

-C- coulomb (SI unit of charge)
-Charge of 6.24 billion billion electrons
-Not big- charge through 100 watt bulb in a second Basics Coulomb's Law Video Discovered by French physicist Charles Coulomb in the 19th century Example Problem Question Two balloons are charged with an identical quantity and type of charge (-6.25 nC). The distance of the separation between them is 67.5 cm. What is the magnitude of the charge between them? Work Disclaimers -Signs aren't used- magnitude
-Vector quantity- negative means attraction
-Positive means repulsion
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