A $3$ phase, $50$ $Hz$, six pole induction motor has a rotor resistance of $0.1$ $Ω$ and reactance of $0.92$ $Ω$. Neglect the voltage drop in stator and assume that the rotor resistance is constant. Given that the full load slip is $3%$, the ratio of maximum torque to full load tarque is
1. $1.567$
2. $1.712$
3. $1.948$
4. $2.134$