Which is true about the inductance of a solenoid?
o it depends on the number of turns per unit length but not on the area of each turn.
o it depends on the area of each turn but not on the number of turns per unit length.
o it depends on the number of turns per unit length and the area of each turn.

It depends on the number of turns per unit length and the area of each turn.

Explanation:

The inductance of a long solenoid can be approximated by:

Where:

Therefore, according to this, we can conclude that  the inductance of a solenoid depends on the number of turns per unit length and the area of each turn.

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached

The answer is: c. from underground