Abstract
Let\etabe a linear, time-invariant, lumped two-port driven at its port 1 by a voltage source e. and loaded at its port 2 by a variable capacitorC. The values of C are restricted byC_{m}\leq \leq C_{m}, whereC_{M}andC_{m}, are given positive constants. Given this inequality constraint onC, any initial state of\eta, a time interval[0, T], and a performance criterion\phiit is shown that the law of variation of C as a function of time which maximizes the value taken by\phiat the state at timeTis bang-bang, i.e.,C(\cdot)is piecewise constant and takes only the valuesC_{m}andC_{M}. A subsidiary result as well as some interpretations are also given.

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