railway RRB JE (CBT I + CBT II) Mock Test 2024 Fluid Mechanics Fluid Kinematics

अपरिवर्तनीय प्रवाह में, वेग क्षेत्र ________ है।

1
∇/u = 1
2
∇ + u = 0
3
∇ × u = 0
4
∇ - u = 0
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