The circular plates A and B of a parallel plate air capacitor have a diameter of 0.1 m and are 2 x 10 -3 m apart. The plates C and D of a similar capacitor have a diameter of 0.12 m and are 3 x 10 -3 m apart. Plate A is earthed. Plates B and D are connected together. Plate C is connected to the positive pole of a 120 volt battery whose negative is earthed. Calculate
(i) The combined capacitance of the arrangement and
(ii) The energy stored in it.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
[(i) 
, (ii) 122.4 nJ]
Sol.
C 1 = 
= 
C 2 = 
= 
C eq = 
= 
The energy stored U = 
C eq V 2
= 
× 17 × (120) 2 × 10 – 12 = 122.4 n J
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