Shares of Indian edtech firm PhysicsWallah soared as much as 48.6 per cent in their trading debut on Tuesday, notching a $5.2 billion valuation and signaling renewed interest in a sector that has been under financial strain. It is the first edtech firm to go public after the sector saw Byju's - valued at $22 billion at its peak - going into bankruptcy and players such as Unacademy struggling with layoffs.  PhysicsWallah's shares rose to as much as 161.99 rupees as of 11:24 a.m. IST in Mumbai,