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Questions and conceptual exercises. a) What is the difference between a polar and a non-polar molecule,...

Questions and conceptual exercises.
a) What is the difference between a polar and a non-polar molecule, and what happens to them in the presence of an external electric field E?
b) Explain in your own words, why do electric currents move in the opposite direction of electrons?

Exercise:

Considering a battery of a certain fem ξ and an internal resistance r. What value of the external resistance R must we connect between the terminals to obtain the maximum power in the resistance?


In a proton accelerator machine, these particles in a 5mA beam move at almost the speed of light. (a) How many protons exist per meter of beam? (b) if the cross section of the beam is 10-6?2, what is the numerical density of the protons?

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