Field angular momentum in Feynman's disk paradox

The angular momentum in static electromagnetic fields has always been a fascinating subject.1-10 Feynman's disk paradox1 is a striking example of this. In their recent article on Feynman's disk paradox, Bahder and Sak2 calculated the angular momentum in two ways, one by using Faraday's law, the other by using Lorentz force law. Although it was asserted that the angular momentum is stored in the fields, the direct approach to calculate this angular momentum from the fields has not been shown. We present this calculation so that students may understand the reason angular momentum is said to be stored in the fields.