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The circles with their centre on the X axis _____________

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in Aerodynamics by (773k points)
The circles with their centre on the X axis _____________

(a) eccentric circles

(b) concentric circles

(c) potential lines

(d) equal circles

I have been asked this question in an interview for job.

My question is based upon Vortex Flow topic in division Inviscid & Incompressible Flow of Aerodynamics

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Correct option is (c) potential lines

The best I can explain: Potential lines are eccentric non-intersecting circles with their centres on x-axis. The potential lines for source pair will be eccentric non-intersecting circles.

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