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# Physics/physics - vector calculus

Question
what is the application of del operator?????.......why is it really used?????....what does it actually do???????.......and one more thing , what is application of calculating 'differentiation'?????

The del operator is shorthand for three separate derivative operators, each operating in their orthogonal (meaning at right angles) dimensions.  Written out in full, that's all it is.  It's used when derivatives are required in all three dimensions.  Differentiation means the rate of change.  Therefore the del operator, when acting on something like a function describing voltage over three dimensions, gives the rate of change through space.  In this specific example, that would give you the electric field throughout space.  There are countless other uses, that's just one example.

Physics

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