Margin Required Now Onward

Hi All
With recent changes By NSE and SEBI, regarding charges and margins required.Can anyone explain what will be required margin, with an example?

Say i keep 10000Rs in my trading account.
to trade in bank nifty options for intraday and till expiry, how it will be calculated.
to trade in any particular stock in options for intraday and till expiry, how it will be calculated.
to trade in equity, for any particular stock, for intraday or for delivery , how it will be calculated.
for simplicity, take 1 lot or no of stock is 1.

thanks