**Correct option is:** \(\frac{2T}{pdg}\)

Ascent formula h = \(\frac{2T\,cos\theta}{prg}\)

**where,**

T = surface tension

θ = contact angle

r = separation small

ρ = density

g = acceleration due to gravity

**given,**

θ = 0°

r = d

Then, the rise of liquid column

h = \(\frac{2T\,cos\,0^\circ}{pdg}\)

∵ cos 0° = 1

h = \(\frac{2T}{pdg}\)