Practice Quiz

MCAS Physics Exam Practice

Category - Introductory Physics

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A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery, the compass needle changes position.Which of the following is the bestexplanation for the movement of the needle?
  1. The copper wire magnetizes the needle to create a force.
  2. The needle magnetizes the copper wire to create a force.
  3. The current in the wire produces a magnetic field and exerts a force on the needle.
  4. The insulation on the wire becomes energized and exerts a force on the needle.
Explanation
Answer: C - The current in the wire produces a magnetic field and exerts a force on the needle.
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