Two connections allow contact with two circuit elements in series inside a box, but it is not known whether the circuit elements are R,L, or C. In an attempt to find what is inside the box, you make some measurements with the following results. When a 3.0-V dc power supply is connected across the terminals , there is a direct current of 300 mA in the circuit. When a 3.0-V, 60-Hz source is connected , the current becomes 200 mA. a) What are the two elements in the box? b) What are their values of R, L or C?