If you are asking for a proof on having at least 3 dimensions in space, you can find the physical proof anywhere in your daily life activities. Just the fact that solids have volumes is a proof already that we live in a three-dimensional space. We can move forwards, backwards, sidewards and in all other directions possible.
When you go right into detail, the fundamental laws governing these proofs are very technical. They have differential equations to show as proof. It is too detailed to discuss here. The important things is that, these fundamental laws are what explains the science in our basic activities and natural phenomena:
*Gravitation and planetary motion
* Translation, rotation, magnetic field, forces
* Integrals of equations:
Answer:
When a plastic rod is rubbed with a cloth, it becomes charged. Electrons are rubbed off the cloth and onto the rod by friction. This leaves the rod with a negative charge and leaves the cloth with a positive charge.
This is the mechanism behind a thermocouple (choice D). The two metals generate a magnetic field between them when the temperature is varied, and this causes a voltage (potential difference) to form between the metals. An electronic meter is calibrated to translate this voltage difference into a temperature value for a user to read.