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)
		
			
			
			
			
			
			
			
			
			
>
	
            
            

                
Paltu Sen
			
Please see the expression of divergence in spherical polar coordinates. Here only 1st term of the experssion is taken since E is spherically symmetric( independent of theta and phi). see attachment