Page 11 18. A circuit containing a capacitor is set up as shown. 6∙0 V 480 Ω 120 Ω 30 μF The supply has negligible internal resistance. The maximum energy stored in the capacitor is A 5·4 × 10−4 J B 3·5 × 10−4 J C 1·4 × 10−4 J D 3·4 × 10−5 J E 2·2 × 10−5 J. 19. A student makes the following statements about conductors, insulators and semiconductors. I In conductors, the conduction band is completely filled with electrons. II In insulators, the gap between the valence band and the conduction band is large. III In semiconductors, increasing the temperature increases the conductivity. Which of these statements is/are correct? A I only B II only C III only D I and II only E II and III only [Turn over for next question