Final answer:
The statement that as amperage decreases, flux lines increase is false. Arc blow involves magnetic fields and the number of flux lines, which actually decrease as the current drops.
Step-by-step explanation:
The statement regarding arc blow that as amperage decreases, flux lines increase is false. Arc blow is a welding phenomenon that involves the deflection of an electric arc from its intended path due to magnetic disturbances in the vicinity of the weld. It is influenced by magnetic fields and current flow, not just the amperage in isolation. The flux lines are related to magnetic fields around a conductor, and they increase with the current (amperage). As the current decreases, the magnetic field strength also decreases, which means fewer flux lines, not more.
For educational purposes, let's also discuss the other true or false statements:
- If you drop a bar magnet through a copper tube, it induces an electric current in the tube. - True
- The electric-field lines from a positive point charge spread out radially and point outward. - True
- The high-voltage wires that you see connected to tall metal-frame towers are not wrapped in an insulating material. - False
- A current is created in a photoconductive cell, even if only one electron is expelled from a photon strike. - True