The velocity potential function for a source varies with

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The velocity potential function for a source varies with the distance r as

1. 1/r
2. 1/r²
3. er
4. In r

Correct Option: D

U_r =	δφ	-	- q
	δr		2πr

φ =	- q	In r + c
	2π

(2) 1 –d, 2 – d, 3 - c
(3) Closed contour in a flow field.