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
You are given a dipole of charge \( +q \) and \( -q \) separated by a distance \( 2l \). A sphere 'A' of radius \( R \) passes through the centre of the dipole as shown below and another sphere 'B' of radius \( 2R \) passes through the charge \( +q \). Then the electric flux through the sphere A is
Two charges, \( q_1 = +3 \, \mu C \) and \( q_2 = -4 \, \mu C \), are placed 20 cm apart. Calculate the force between the charges.
An inductor and a resistor are connected in series to an AC source of voltage \( 144\sin(100\pi t + \frac{\pi}{2}) \) volts. If the current in the circuit is \( 6\sin(100\pi t + \frac{\pi}{2}) \) amperes, then the resistance of the resistor is: