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

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)