Hello Bishwajit das sir

I am a big fan of you. The way you have explained the Gauss Law, is very good.

Can you please explain me the Bernoulli theorem. Please

Bernoulli's principle thus says that a rise (fall) in pressure in a flowing fluid must always be accompanied by a decrease (increase) in the speed, and conversely, if an increase (decrease) in , the speed of the fluid results in a decrease (increase) in the pressure”.
For detailed theory you can refer to our free study material on following link
http://www.askiitians.com/forums/General-Physics/state-and-prove-bernoulli-s-theorem_76262.htm