Electromagnetic Induction

Voltage can be induced in a wire by

• a. moving the wire near a magnet.
• b. moving a magnet near the wire.
• c. changing the current in a nearby wire.
• d. all of these

Tags

NGSS.HS-PS2-5

A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage

• quadruples

• doubles

• is the same

• halves

What benefit is gained by the addition of the iron core in an electromagnet?

• It makes a strong magnet weaker

• It makes a weak magnet stronger

• There is no benefit at all

• It lets currents interact with each other

Electromagnetism is when

• magnetism causes electricity

• electricity causes magnetism

• electricity and magnetism cancel each other out

• a strong magnet creates a permanent magnet

How would flipping the magnet in this experiment change the current?

• The current would not change
• The current would go to the right
• There would be no current
• The current would go CRAZY

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

In electromagnetic induction, what is being created?

• Magnetism

• Electrical energy

• Mechanical energy

• Chemical energy

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

A group of students investigating electromagnetism sets up a wire flat on a table, along with three compasses as shown. Once they hook the wire to a battery, the students see the compasses do nothing. What explains their results?

• The magnetic field is going straight up / down where the compasses are, and they can't turn to point that way.

• They only investigated one variable, which isn't enough to get results.

• They have verified that a current doesn't create magnetic field.

• Current cannot flow without something like a light bulb or other resistor