1. A capacitor consists of two
(a) insulation separated by a dielectric
(b) conductors separated by an insulator
(c) ceramic plates and one mica disc
(d) silver-coated insulators
2. The capacitance of a capacitor is NOT influenced by
(a) plate thickness
(b) plate area
(c) plate separation
(d) nature of the dielectric
3. A capacitor that stores a charge of 0.5 C at 10 volts has a capacitance of …..farad.
(a) 5 (b) 20
(c) 10 (d) 0.05
4. If dielectric slab of thickness 5 mm and år = 6 is inserted between the plates of an air capacitor with plate separation of 8 mm, its capacitance is
(a) decreased (b) almost doubled
(c) almost halved (d)unaffected
6. A parallel plate capacitor has an electrode area of 100 mm2, with a spacing of 0.1 mm between the electrodes. The dielectric between the plates is air with a permittivity of 8.85 × 10–12 F/m. The charge on the capacitor is 100 V. the stored energy in the capacitor is
(a) 8.85 pJ (b) 440 pJ
(c) 22.1 nJ (d) 44.3 nJ
Answers
1. b 2. a 3. d 4. b
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