Dc does not have any cycle and consists of positive and negative(like square waveform) polarity, and the frequency of DC supply is always zero because the time period is infinity. But, in case of AC,...
It states that if net torque acting on an isolated system is zero, the angular momentum remains conserved. Since Torque is equal to the rate of change of angular momentum so when torque is zero, dL/dt=0 So,...