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Magnetism from Electricity
Chapter 16, Section 2 - Review
USING KEY TERMS: For the pair of terms, explain how the meanings of the terms differ.
1. electromagnet and solenoid
__An electromagnet is a solenoid that has an iron core, so an electromagnet__
___has a stronger magnetic field than the solenoid has. ___________________
UNDERSTANDING KEY IDEAS
__d__ 2. Which of the following actions will decrease the strength of the
magnetic field of an electromagnet?
a. using fewer loops of wire per meter in the coil
b. decreasing the current in the wire
c. removing the iron core
d. All of the above
3. Describe what happens when you hold a compass close to a wire carrying a current.
___The needle may deflect and not point north__________________________
_________________________________________________________________
4. What is the relationship between an electric current and a magnetic field?
____An electric current induces a magnetic field. A changing magnetic______
_____field can induce an electric current_______________________________
5. What affects the strength of an Electromagnet?
_____The number of loops in the solenoid and the amount of current_______
______passing through the solenoid___________________________________
CRITICAL THINKING
6. Applying Concepts What do Hans Christian Oersted’s experiments have to do
with a galvanometer? Explain your answer.
___Oersted’s conclusion that an electric current induces a magnetic field ____
___led to the development of electromagnets. A galvanometer measures the
___interaction between the magnetic field produced by an electromagnet and
___the magnetic field of a permanent magnet. __________________________
7. Making Comparisons Compare the structures and magnetic fields of solenoids
with those of electromagnets.
____A solenoid is a coil of wire that carries electric current. An electromagnet
___is a solenoid that has an iron core. An electromagnet has a stronger ______
___magnetic field than just the solenoid has. ___________________________
INTERPRETING GRAPHICS
8. Look at the image below. Your friend says that the image shows an
electromagnet because there are loops with a core in the middle. Did
your friend create an electromagnet? Explain your reasoning.
__No, the loops of an electromagnet must be loops of wire, not ring magnets._
__The core of an electromagnet must be made of iron. The core in the image _
_____is a pencil.___________________________________________________