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When velocity potential (Φ) is constant, it is called as _________

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When velocity potential (Φ) is constant, it is called as _________

(a) velocity line

(b) velocity curve

(c) potential line

(d) equipotential line

The question was asked during a job interview.

My question is taken from Doublet Flow in portion Inviscid & Incompressible Flow of Aerodynamics

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Best answer
Right answer is (d) equipotential line

The best explanation: The line along which the velocity potential (Φ) is constant is called a equipotential line. For an equipotential line,

Φ=constant and also dΦ=0

The slope for the equipotential line can be given as=dy/dx.

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