Equivalent capacitance between A and B is nC. Write n.
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Answer:
n = 4
Explanation:
I'll explain the trick here rather than total solution.
If you can re-draw the capacitance system in such a way that you'll be able to see than CD forms a wheatstone bridge like condition. Which means you can cut the capacitor between C & D, the reason being potentials of C & D will be same hence no charge will be there in the capacitor between them.
Once you cut that capacitor, things will be obvious
Equivalent capacitance about AB is
Ceq = 2C || (2C series with 2C) || (2C series with 2C)
(2C series with 2C) = 2C*2C/(2C+2C) = 1C
Ceq = 2C || 1C || 1C = 2+1+1 = 4C
Ceq = 4C
n = 4
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