For the networks shown in the figures (a) and (b) to be

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For the networks shown in the figures (a) and (b) to be duals, it is necessary that R′, L′ and C′ are respectively equal to—

1. 1 , C and L
  R
2. 1 ,
  1 and
  1
  R L C
3. R, 1 and C
  L
4. 1 , L and
  1
  R C

Correct Option: A

In order to make the dual network. simply replace voltage by current, current by voltage, inductance by capacitance resistance by conductance and capacitance by inductance.
From fig. (a)

V = iR + L		di	+	1	∫ i dt ......(i)
		dt		C

from fig. (b)

I = V′ G′ + C′		dV	+	1	∫ V´ dt ......(ii)
		dt		L

On comparing equation (i) and (ii), we get
R = G′
L′ = C
C′ = L