Watch Hewitt-Drew-it! Electric Field #89 and complete #1 through #19 below.
1. ______________ like gravitational forces can act over a distance, no contact
necessary.
2. A conceptual way of describing forces that act over a distance involves the concept of
a _______________.
3. Using the field concept, the gravitational force on a satellite can be found by
multiplying the _________ of the satellite by the ___________ , g of the planet where
the satellite is located.
4. The unit of the gravitational field is the ___________ and its strength varies with the
______________ of the distance to the center of the planet.
5. The gravitational, g field plays an intermediate roll between objects, likewise in
______________.
6. For example, a proton is surrounded by its _______________. Using the field
concept, the electric force on an electron can be found by multiplying the _________ of
the electron by the _________________ , E of the proton where the electron is located.
7. The magnitude of the electric field is the ____________ per unit _____________ and
has the unit the _________.
8. Indicate the direction of each of the fields shown below.
9. The direction of the electric field about the proton is the direction of the electric force
on a _____________ charge in the field.
10. The electric field set up by a positive charge points radially __________ and that of
a negative charge points radially __________.
11. Sketch the electric field about a pair of equal and opposite charges.
12. The curved pattern of the electric field about a pair of equal and opposite charges is
the ___________ of pairs of straight lines, outward from the positive charge and
inward for the negative charge.
13. For each of the locations #1, 2, and 3 shown on the diagram below, show the
electric force due to each charge and then the corresponding resultant electric force.
14. Sketch the electric field about a pair of like charges.
15. Sketch the electric field about a pair of equal and oppositely charged parallel plates.
This arrangement of charges is called a ________________.
16. Sketch the electric field about a plate and cylinder that have opposite charges.
17. Inside any charged body the electric field strength is ____________.
18. The following is a diagram of a Van de Graaff generator. Fill in the three blanks.
The Van de Graaff Generator
Sunday, March 22, 15
19. Voltage is equal to _________ divided by __________. Its unit is the _________ per
___________. This is the reason that a 200,000 volt Van de Graaff generator is not
dangerous to touch. A little bit of charge with a corresponding small amount of energy
can do little harm if any to an animal, whereas an exposed electrical socket can, due to
the fact that there is an endless supply of charge and energy available to do serious
harm.