The principle mentioned in the question refers to the ability of a Van de Graff generator to accumulate large amounts of charge on a conducting sphere. This device uses the concept of continuous charge transfer and electrostatic induction to accumulate and store high-voltage electric charge. Thus, the principle described corresponds to the Van de Graff generator, which operates by continuously transferring charge onto a large conducting sphere.
Final Answer: Van de Graff generator
In the given circuit, the electric currents through $15\, \Omega$ and $6 \, \Omega$ respectively are
