question_answer 9)

Explain what would happen if in the capacitor given in Q.2.8, a 3 mm thick mica sheet (of dielectric constant = 6) were inserted between the plates, (a) while the voltage supply remained connected. (b) after the supply was disconnected.  

Answer:

(a) (i) C' =                 (ii) q = C?V =108 × 100                 = 1.08 × 10?8C                 (b) q remains 1.8 × 10?9 C;                 Capacitance = 108 pF