Final answer:
True, dropping a bar magnet through a copper tube induces an electric current in the tube due to electromagnetic induction, as explained by Faraday's Law and observed by Lenz's Law.
Step-by-step explanation:
The question is addressing a physical phenomenon related to electromagnetism, specifically electromagnetic induction. When a bar magnet is dropped through a conductive tube, such as one made of copper, it indeed induces an electric current in the tube. This is because the moving magnetic field of the magnet creates a change in the magnetic environment of the tube, which according to Faraday's Law of electromagnetic induction, generates an electromotive force (EMF) and consequently an electric current in the copper tube. This current then creates its own magnetic field in opposition to the field of the falling magnet, which results in a slowing of the fall of the magnet—a phenomenon observed as Lenz's Law. Therefore, the correct answer to the question is b. true.