Question

way do we have to wait for some time after adding or removing of weight to the wire

Answer 1

Since the options are not given, I am giving a general answer.

The correct answer is - To avoid any backlash error.

When an external force like a weight or load is added to a solid material like a wire, the wire will undergo elastic deformation based on the extent of the force.

It is important to take readings to study the elastic deformation to understand the endurance capacity of the solid material. So, after a reading is taken, it is advised to wait for sometime after removing the load or after the load is added before the next reading is taken. The waiting time is usually till the pointer reaches zero so that the wire can reach a steady state. This is because the small time gap will help the solid material or the wire to contract or to elongate fully.