Electricity

Charge model ,[object Object],[object Object],[object Object],[object Object],[object Object]

Charge model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A charged rod is brought near the spheres. The spheres are separated and the rod is taken away. A B C D ++++++ ++++++ ,[object Object],[object Object],[object Object],[object Object]

A charged plastic rod is brought near an uncharged metal rod on an insulating stand. An uncharged metal ball is hanging near the other end of the metal rod. What happens to the ball?

An electroscope is charged by touching it with a positive glass rod. The electroscope leaves spread apart, and the glass rod is removed. Then a negatively charged plastic rod is brought close to the top of the electroscope but doesn’t touch it. What happens to the leaves?

Charge ,[object Object],[object Object],[object Object],[object Object],[object Object]

Rank in order from most positive to most negative, the charges q A to q E of these five systems. ,[object Object],[object Object],[object Object],[object Object],[object Object]

How big is a Coulomb? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Coulomb’s Law ,[object Object],[object Object],[object Object],[object Object],+ + r F 1 on 2 F 2 on 1 q 1 q 2

Coulomb’s Law ,[object Object]

Adding electric forces in one dimension ,[object Object],+ + + 0 1 2 x (cm)

Adding electric forces in two dimensions ,[object Object],- + + q 1 = - 50 nC 2 10.0 cm 5.0 cm q 3 = +30 nC q 2 = + 50 nC

[object Object],Electrical v. gravitational force - + 1.0 cm 2 q g = +10 nC q p = + 50 nC

Electric Field from a Point Charge

Electric Field Lines for a Point Charge

Electric Field from Two Point Charges

Electric Field between Two Plates

Movement of a Charged Particle in an Electric Field

Electricity

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