Question

please answer me what is pointing vector

Answer 1

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In physics, the Poynting vector represents the directional energy flux (the energy transfer per unit area per unit time) of an electromagnetic field. The SIunit of the Poynting vector is the watt per square metre (W/m2). It is named after its discoverer John Henry Poynting who first derived it in 1884.132Oliver Heaviside also discovered it independently.

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Answer 2

For a closed curve CC parameterised anti-clockwise, the outward-pointing normal vector N→N→is described as (b,−a)(b,−a), if the tangent vector r′→=(a,b)r′→=(a,b).

I'm seeking an analytical way to remember this outward-pointing normal vector without rote memorisation; therefore, given some tangent vector (a,b)(a,b) I need to be able to derive it somehow and/or reason about it.

I need to know such a vector for the purpose of calculating flux across a curve. And the reason I want to be able to derive it without rote memorisation is because I don't think rote memorisation is a good strategy for understanding concepts and/or remembering things during examinations.

I was wondering if people could please take the time to provide me with such a methodology so that I may be able to learn the concept more effectively.