School Improvement in Maryland

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Standard 5.0 Physics

Topic C. Electricity and Magnetism

Indicator 3. Identify and describe magnetic fields and their relationship to electric current.

Objective b. Investigate and explain ways to change the strength of a simple electromagnet by varying the number of coils wrapped, the amount of electricity in the wire, the number of batteries used, and whether or not an iron core is used.

Selected Response Item

A doorbell contains a simple electromagnet.

Which change would most likely increase the strength of an electromagnet?

  1. longer wires
  2. fewer wire coils
  3. an aluminum core
  4. a larger power source
/share/assessment_items/xml/items/msa_science_6_018.xml

Correct Answer:
D