Electromagnetic Induction

The unit of magnetic flux is the

• Henry
• Tesla
• Faraday
• Weber

 Faraday's Law states that the induced emf is directly proportional to 

• the current 
• the cross sectional area of the coil 
• the rate of change in the flux of the coil

Electromagnetic induction is change in ___________________. 

• surface area
• magnetic poles
• magnetic flux

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

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

What is one way to increase the induced 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

When a conductor is moved to cut through the magnetic flux, an _______________ is produced.

• induced current

• electromotive force

• electromagnetic induction

• internal resistance

The production of electric current by a changing magnetic field is called ____________________________________.

• induced current

• electromotive force

• electromagnetic induction

• internal resistance

The symbol and units of inductors are

• L (Henrys)

• C (Conductance)

• F (Flux)

• C (Farads)

 Inductor stores energy in the form of

• electromagnetic field

• electric field

• magnetic field