If the electrical circuit of Fig.(b) is an equivalent of

If the electrical circuit of Fig.(b) is an equivalent of the coupled tank system of Fig.(a), then

1. A, B are resistances and C, D capacitances
2. A, C are resistances and B, D capacitances
3. A, B are capacitances and C, D resistances
4. A, C are capacitances and B, D resistances

C₁ = capacity of tank (1)
C₂ = capacity of tank (2)
h₁, h₂ = heights of water
Q₁, Q₂ = flow rates
R₁, R₂ = resistances of flow

Q₁ = Q₂ + C₁	dh₁
	dt

Q₂ = Q₃ + C₂	dh₂
	dt

∴ Q₂ =	h₁ - h₂	, Q₃ =	h₂
	R₁		R₂

Equivalent circuit :

∴ A, C = capacitance
B, D = resistances