Electromagnetism

Question 1

If the amount of electric current going through a wire is increased, the strength of the magnetic field surrounding it will…
a. increase
b. decrease
c. stay the same
d. reverse

Answer 1

a. increase

Question 2

The NORTH end of one magnet will _______ the SOUTH end of another magnet.

Answer 2

Attract

Question 3

Decreasing the number of turns of wire in a coil that has a current running through it will ____ the strength of the magnetic field.

Answer 3

Decrease

Question 4

When magnets get closer together, the magnitude of the force between them becomes _______.

Answer 4

Stronger

Question 5

The NORTH side of one magnet is facing the NORTH side of another magnet, and they are 1 millimeter from each other. The amount of magnetic potential energy in this situation is ________.

Answer 5

Relatively large.

Question 6

The NORTH side of one magnet is facing the SOUTH side of another magnet, and they are 1 millimeter apart. The amount of magnetic potential energy in this situation is _______.

Answer 6

Relatively low.

Question 7

An electron with a negative charge and a proton with a positive charge are close to each other. Given what you know about electromagnetism, you would expect them to _________.

Answer 7

Attract each other.

Question 8

An electron with a negative charge and a proton with a positive charge are close to each other. If the negative charge of the electron is doubled, the force between them would ____.

Answer 8

Double

Question 9

The north side of one magnet and the south side of another magnet are facing each other, and are close to each other. If the distance between them is doubled, the force between them would _______.

Answer 9

Be one fourth as strong as it was.

Question 10

If you change the direction of the current running through a coil of wire, the magnetic field surrounding it will _____.

Answer 10

Reverse

Question 11

Grab a piece of paper and draw a cross-section of a wire that is going into your computer screen (with current running from this side to the other), and include the correct direction of the field. (Use the right hand rule)

Answer 11

Your drawing should have an x in a circle. The arrow to show the direction of the field should be circling the “wire” clockwise.

Question 12

Your friend says that if you cut a magnet in half, you’ll get one half that is just a “north” magnet, and one half that is just a “south” magnet. Are they right?

Answer 12

No, you would get two separate magnets.