What is Gauss law actually?? I know that the surface integral of electric field and area across aclosed loop is 1/epsilon not times the charge enclosed in it. But how to use it, I m unable to solve the questions related to it.

dear neelam 
kindly get back with the question , 
u need to just apply the formula , the area of the loop will be given in the ques , and u need to calculate the surface integral , else , electric field u need to calculate , 
IF U HAVE THE QUESTION , THEN LET ME KNOW 
REGARDS