Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Dhairya sharma
just use the stoke curl theorem and then u can solve it. but remember we have information about how's coordinates in spherical cordinate system .
and in hemispherical r will change from o to R , thitha will from o to π/2 and phy from o to 2π.