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Physics Chapter 33

Electric Fields and Potential

QuestionAnswer
The electric field inside an uncharged metal ball is zero. If the ball gains a negative charge, the electric field inside the ball will be zero.
A volt is a unit of electric potential.
When an electron is brought near a negatively charged sphere, its potential energy increases. The reason this happens is that work was done to bring the charges together.
Electrical potential energy is the energy a charged object has because of its location.
A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then positively charged.
Every proton in the universe is surrounded by its own gravitational field and electric field.
A small, positively charged object near a positively charged sphere is moved closer to the sphere. The electrical potential energy of the small object increases.
The electric field lines between two charges curve in space. The direction at a particular point on a curved line is the direction of the resultant vector of the fields of the two charges at that point.
An electroscope is charged positively, as shown by foil leaves that stand apart. As a negatively charged rod is brought close to the electroscope, the leaves move closer together.
Coulomb's law says that the force between any two charges depends inversely on the square of the distance between the charges.
Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles have the same sign.
Electrical potential energy is the energy a charged object has because of its location.
After you rub a balloon on your hair, the balloon will likely be charged to several thousand volts.
Created by: Cinda
 

 



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