Name: ______
Study Guide- Electricity and Magnetism
1.The diagram shows two copper spheres. Sphere 1 is negatively charged, and Sphere 2 is neutral.
a.How will charge be transferred when the two spheres touch?
b.What charge will Sphere 2 have?
c.After they touch, will the charge of Sphere 1 be more, less, or the same than in the diagram?
2.If a neutral metal comb is held near an object with a negative charge, the comb will become charged by ______
3.When charge is transferred, the subatomic particle involved is the ______
4.If the two charges represented in the figure below were brought near each other, they would ______
5.In walking across a carpet, how is charge being transferred?
6.Which materials allow charges to flow easily? Give examples!
Which materials make it difficult for charges to flow? Give examples!
7.Give 4 ways to reduce the resistance of a metal wire.
a.c.
b.d.
8.A complete path through which charge can flow is an electric ______.
9.Like poles ______and opposite poles ______each other.
10.How does the magnetic force exerted by a magnet change as the distance between two magnets increases?
11.The region where a magnet’s force is strongest is at the ______.
12.Draw 3 magnets arranged end-to-end so that there will be no attraction between them.
13.What will happen to the poles of a permanent magnet if you cut the magnet in half? How many total poles will there be between the two magnets? You may draw a picture.
14. Define “magnetic domain.”
15.Explain the difference in the magnetic domains of temporary and permanent magnets.
16.How can a permanent magnet be demagnetized?
17.How can we artificially create magnetism?
18.Moving a magnet inside a coil of wire will induce a voltage in the coil. How can the voltage in the coil be increased?
19.A coil of wire that is carrying a current and produces a magnetic field is a ______
20.A student builds an electromagnet using a variable power source and 40 turns of wire. The electromagnet is used to pick up metal paper clips. The student changes the voltage and counts the number of paper clips that are picked up. What will happen to the number of paper clips the magnet picks up as the voltage increases?
21.What 3 properties can you change to increase or decrease the strength of an electromagnet?
1.
2.
3.
22. How many poles does a bar magnet have and what are they called?
23. Explain why an electromagnet is a temporary magnet.
24. What are the THREE components necessary to form an electrical circuit?
25. What is the difference between an open circuit and a closed circuit? In which type of circuit can electrons flow?