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Divergence and Curl Video Lecture | Mathematical Physics for GATE - GATE Physics

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1. What is the definition of divergence and curl in vector calculus?
Ans. Divergence is a scalar quantity that measures the rate at which a vector field diverges from or converges to a point. Curl is a vector quantity that represents the rotation or circulation of a vector field around a point.
2. How are divergence and curl calculated mathematically?
Ans. The divergence of a vector field F, denoted as ∇ ⋅ F, is calculated as the dot product of the gradient operator (∇) and the vector field F. The curl of a vector field F, denoted as ∇ x F, is calculated as the cross product of the gradient operator (∇) and the vector field F.
3. What are the physical interpretations of divergence and curl in physics?
Ans. In physics, divergence represents the net flow of a vector field out of or into a point, while curl represents the circulation or rotation of a vector field around a point. Divergence is related to sources and sinks in a field, while curl is related to the presence of vortices.
4. How are divergence and curl used in the study of electromagnetic fields?
Ans. In the study of electromagnetic fields, divergence is used to describe the electric flux through a closed surface, while curl is used to describe the circulation of the magnetic field around a closed loop. These properties are crucial in understanding Maxwell's equations.
5. Can divergence and curl be zero for a vector field?
Ans. Yes, divergence and curl can be zero for a vector field. If the divergence is zero, it indicates that the field has no sources or sinks. If the curl is zero, it indicates that the field is irrotational and has no circulation.
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