Investors’ wealth eroded by Rs 3.46 lakh crore on Wednesday as equity markets took a sharp tumble amid weak global trends and foreign fund outflows. The 30-share BSE Sensex fell by 676.53 points or 1.02 per cent to settle at 65,782.78. During the day, it plunged 1,027.63 points or 1.54 per cent to 65,431.68.