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magnet 5. Drop a short cylindrical bar magnet down a vertical copper pipe (Fig. 4). A short cylindrical bar magnet is dropped down a vertical copper pipe of slightly large diameter, . . . .-.- about 1.0 m long. It takes several seconds to merge 1.0 m at the bottom, whereas it takes a fraction of a Cu pipe second to make the trip in the air. Why? Figure 4 Drop a short magnet bar down a Cu pipe