1. The problem statement, all variables and given/known data I am supposed to prove that linearity holds for energy storage elements. 2. Relevant equations So far I have got to know that linearity can be proved by superposition. 3. The attempt at a solution I attempted to make a circuit with a resistor, capacitor, a voltage source and a current source. Suppresed the sources one by one and solved the first order differential equations but did not get to the linearity. Equations didnt satisfy the superposition principle. What is the correct way to prove it ?