Question

64 identical drops each of capacity 5μF combine to form a big drop. Capacity of the big drop will

A) 4μF

B) 25μF

C) 20μF

D) 164 μF

Answer 1

The correct option is C) 20μF.

We first find volume of big drop Volume of big drop = 64 x volume of small drop

4/3 π.R3 =64 x 4/3 π.r3

R = 4r

Because capacitance of solid spherical body directly proportion to radius

Hence big drop capacitance = 4 x capacitance of small

Capacitance of big drop=20μF