Comment on POA - Power of Attorney for your Demat account
Senthil, you will have to first pledge the stock to get margin. Once pledged, and after deducting the applicable haircut, the rest of the margin is added to your trading. So assuming haircut is 20% ,then Rs 8000 is credited to your account. With 8000 you can trade F&O for upto 2.5 times of this for intraday .