An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 48 mm and 84 mm

The electric potential of the inner conductor with respect to the outer conductor is -400 V. (k = 1/4??0 = 8.99 × 109 N • m2/C2 ) The energy stored in a 1.0-m length of this capacitor is closest to
A) 8.0 ?J.
B) 5.7 ?J.
C) 11 ?J.
D) 16 ?J.
E) 22 ?J.

A

Physics & Space Science

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Suppose we increase the absolute temperature of a semiconductor from 200 K to 300 K. By roughly what factor does this make the semiconductor more conductive? (Hint: How much more likely is it for a conduction band energy level to be occupied by an electron?)

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