Question

if we go by diging a hole from nort pole to pole which is passes from center of earth or the diameter of earth and if we go from the surface of earth then which is displacement​

Answer 1

Firstly it isn't possible for someone or something to pass from the centre of the Earth unless you want to burn yourself in hot magma.

LOL

Displacement is mathematically the movement of object from one point to another by the shortest path possible.