Electromagnetic Induction

Electromagnetic induction is change in ___________________. 

• surface area
• magnetic poles
• magnetic flux

Voltage can be induced in a wire by

• moving the wire near a magnet.

• moving a magnet near the wire.

• changing the current in a nearby wire.

• all of these

What would happen if I move a bar magnet in and out of a coil of copper wire?

• Electric current would disappear 
• The magnet would explode 
• Electric current will flow through the wire
• It would produce a gravitational field

A magnet can move in a coil of wire to produce electricity in which system?

• Generator
• Motor
• Magnet
• Transformer

Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out
• Move the magnet back and forth
• Take the magnet out
• Add more coils around the paper cylinder

Electromagnetic induction is taking place in this experiment. How much electricity is being produced?

• -10 Volts
• 10 Volts
• 100 Volts
• This question cannot be answered based on this image

What is one way to increase the current in a wire?

• Decrease the number of coils
• Increase the number of coils
• Move the magnet slower
• Take the wire off of the magnet

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

Passing a current through a solenoid will produce

• a magnetic field
• an electric field
• a current field
• nothing is produced