Irrotational Vector field

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A vector field  vector F is said to be irrotational vector if curl of F is equal to zero
▽ x F  =0

Irrotational Vector field Concept














The Above phenomenon is due to Irrotational vector Field.

 Explanation Of above picture:
 Side wheels indicated as red arrow and white arrow are rotating in the direction of Anti-Clockwise and Clockwise respectively

Red arrow- (Wheel)->Anticlockwise
White arrow-(wheel)-> Clockwise

Why Middle wheel does not rotate?
Answer: Middle wheel does not rotates because the flow of water to the surface of wheel does not allow to move.

Why does side wheels rotate?
Answer: Because at the side of river the speed of flow of water is very low as compared to in the center of the river.



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