Hope this answer helps, cause Idk, I might be wrong, but I still, I used the correct formulas, so I might be correct
Copper is; unlike iron and steel; not ferromagnetic, but diamagnetic. This means that induced magnetic fields in copper will counter the applied force.
When you drop a strong magnet through a copper pipe, the moving magnetic field will induce currents (Lenz’ Law). These currents will now induce their own magnetic field. This magnetic field counters the falling magnetic.
Result: the magnet will fall way slower than if it was falling through a plastic pipe.
I believe the answer is b. external stimulus
Using Ohm's Law V = IR
6.0v / 25 = 0.24 A
I = 0.24A
The answer is A. shorter wires
