Why is the magnetic field inside a current-carrying pipe equal to zero?

2) if a solid conducting cylinder was quickly inserted in the hole of the current-carrying pipe, it will not produce eddy currents correct? since the magnetic field inside the pipe is zero?

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

Decreased sensitivity to an unchanging stimulus is known as