A single line to ground fault occurs on an unloaded generator in phase a. If x_d = x₂ = 0.25 p.u., x₀ = 0.15 p.u., reactance connected in the neutral, x_n = 0.05 p.u. and the initial prefault voltage is 1.0 p.u., then the magnitude of the fault current will be ________ p.u.