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The capacity of tokamak plasma is derived using a coaxial-torus capacitor property. The value of this capacitance is significant for tokamaks and dramatically high for the International Thermonuclear Experimental Reactor. Therefore, tokamak plasma will play important roles in time varying regimes (like current ramp-up), transient regimes, edge related phenomena, and many other different. This quantity may be incorporated in circuit equations and transport codes for use in exact simulations of plasma behavior. Because this capacitance property of tokamak produces a radial electric field, it would be of considerable interest.