Round 5: Tossup 4

A quantum mechanical effect decreases the strength of these devices when their constituent materials have a low density of states. AC coupling uses these devices as high-pass filters, blocking direct current. In [emphasize] series, the strength of these devices equals the reciprocal of a sum (10[1])of reciprocals. (10[1]-5[2])Resistance (-5[1])times a characteristic quantity of these devices equals the time constant. An inductor and one of these devices (10[1])make an (10[1])oscillating circuit. (10[1])A quantity named for these devices, which equals charge over voltage, can be increased by inserting a dielectric between two parallel plates. For 10 points, (10[1])what circuit elements that store energy in electric fields name a quantity measured in farads? ■END■ (10[3]0[1])

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