Passage VI

A parallel-plale capacitor (PPC) stores electric charge on 2 separated plates when a voltage is applied across the plates. Figure 1 shows a PPC before (left) and after (right) it was filled with a dielectric (insulating mate­rial). The capacitance of an empty PPC, C0, is the amount of charge stored per unit of applied voltage. The capaci­tance of a filled PPC, Cκ, equals C0 multiplied by the dielectric constant, x, of the filling material. Table 1 gives κ for 12 materials. Table 2 gives the dielectric strength, S (the maximum electric field strength at which a dielectric remains an insulator), for 7 of the materials.

31. For many substances, k depends on temperature. The table below gives k for H2O at several temperatures.

The k for H2O given in Table 1 was most likely measured at a temperature closest to which of the following?

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

The value corresponding to H2O in table 1 is 80.1. Substituting it into the table in the question, it can be seen that the measured temperature is between 0°C-30°C, so the 20 of option A °C fits into this range