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) 
		 
			 
			 
			 
			 
			 
			 
			 
			 
			 30 points
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Ruby negi
yeah dear, there is a mistake in the question, don't worry these types of mistake r not present in exam...if radius is given then this ques is solve same as previous, using Gauss divergence... best regards..