railway RRB JE (CBT I + CBT II) Mock Test 2024 Electromagnetic Theory Vector Calculus

Which of the following represents the differential vector surface area normal to r direction?

1
dS = rdrdϕ 
2
dS = rsinθdrdθ 
3
dS = r2 sinθdθdϕ 
4
dS = rdrdθ 
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