What physical property does the symbol iencl represent? the current along the path in the same direction as the magnetic field what physical property does the symbol iencl represent?

The physical property that the symbol IencI represents is the net of the current that flows through the Amperian loop. The Amperian loop is not actually present, but instead is the area around a current that would exist assuming that Ampere's law is accurate. It is essentially an invisible loop that surrounds the current and represents the physical property of the current.

The speed was not exceeded so it was slow

A. to determine if humans can explore mars safely