The Sensex has slipped into the negative zone and is now down 50 points at 20,678.Bharti Airtel has plunged nearly 4% to Rs 873. ICICI Bank has shed 1.7% at Rs 1,385.Ambuja Cements has declined 1.3% to Rs 136. TCS and Hindustan Unilever are down 1% each at Rs 950 and Rs 217, respectively.Tata Steel and ACC have advanced over 1% each to Rs 849 and Rs 885, respectively.
