El coeficiente de expansión volumétrica se calcula a partir de la siguiente ecuación diferencial parcial (The volumetric expansion coefficient is computed by means of the following partial differential equation):
Se integra la fórmula a continuación (The formula is integrated herein):
Supóngase que el coeficiente es constante (Let suppose that coefficient is constant):
El volumen final es (The final volume is):
El coeficiente de expansión volumétrica del acero es (The volumetric expansion coefficient of steel is ):
Finalmente, la dilatación experimentada por el balín es (Lastly, the dillatation experimented by the pellet is):
The correct answer to this open question is the following.
The J.J Thomson's plum pudding model establishes that when he researched the atom, he found that electrons are positively charged. Because he observed that electrons were embedded like plums. Electrons are negative. However, compared to the modern-day atomic theory, scientist Ernest Rutherford established that the space between an atom is empty, the nucleus of the atom is positive, and negative electrons have fixed motion paths.
If you were moving along with the electrons, they would appear stationary to you. You would measure a current of zero. However, the fixed positive charges in the wire seem to move backwards relative to you, creating the equivalent current as if you weren't moving. You would measure the same field, but the field would be caused by the 'backward' motion of positive particles.