The coaxial capacitor is now attached to a battery and resistive load. calculate the instantaneous power flowing between the inner and outer conductors using the poynting vector, and compare it with the instantaneous power supplied by the battery. 2. a spherical conducting shell of radius a, centred at the origin, has a potential vo vo a/r ifr > а. if r a; v = (i) calculate the energy stored in the electrostatic field. (ii) determine the total charge and use this to calculate the electrostatic energy