Verify whether the following functions are valid potential functions.

(i) 

(ii) ϕ = Acos x

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JKSSB JE CE 2021 Official Paper Shift 2 (Held on 29 Oct 2021)
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  1. Both are valid potential functions
  2. Both are not valid potential functions
  3. (i) Is not a valid function (ii) Is a valid potential function
  4. (i) Is a valid potential function (ii) Not a valid function

Answer (Detailed Solution Below)

Option 4 : (i) Is a valid potential function (ii) Not a valid function
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ST 1: JKSSB JE - Surveying
20 Qs. 20 Marks 20 Mins

Detailed Solution

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Concept:

Properties of Potential functions:

1. If velocity potential (ϕ) exists, the flow should be irrotational.

2. If velocity potential (ϕ) satisfies the Laplace equation, it represents the possible steady incompressible irrotational flow.

Calculation:

Given:

(i) , (ii) ϕ = Acos x.

(I) 

(ii) ϕ = Acos x

Thus (i) is a valid potential function as it satisfies the Laplace equation, whereas (ii) is not a valid potential function as it does not satisfy Laplace equation.

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