Final answer:
Dropping a bar magnet through a copper tube does indeed induce an electric current in the tube due to electromagnetic induction, making the statement true.
Step-by-step explanation:
The original question, "True or false—If you drop a bar magnet through a copper tube, it induces an electric current in the tube. a. false b. true", pertains to the concept of electromagnetic induction. The correct answer is (b) true. As the bar magnet falls through the copper tube, it produces a changing magnetic field within the tube. According to Faraday's Law of Electromagnetic Induction, a changing magnetic field can induce an electric current in a conductor like copper. This phenomenon is also related to Lenz's Law, which states that the induced current will flow in a direction that opposes the change that produced it, thus causing the magnet to fall more slowly through the tube.