The answer is experimental. Thats the only investigation that involves a control group.
hope this helps
The charge on the electron is 1.6x10^-19C. So, 10^24 of them will be a charge of 1.6x10^5C, F = q1xq2/[(4pi epsilon nought)r^2]
The answer is Conduction: the process of heat is directly transmitted through a substance when there is a difference in temperature.
