Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be

a. 2: 1

b. 1: 4

c. 4: 1

d. 1: 2

Answer: (b)

Given that first connection

JEE Main 2021 24 Feb Physics Shift 1 Question 4 solution

Second connection

C34 = C + C = 2 C

Now, the ratio of equivalent capacities in the two cases will be –

⇒ C12 / C34 = C2 / 2C ⇒ C12 / C34 = ¼

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