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The expression for pointing vector of an isotropic point source at a distance ‘r’ from the source is given by:

The expression for pointing vector of an isotropic point source at a distance ‘r’ from the source is given by: Correct Answer P/ 4πR2

The pointing field vector for an isotropic source is given by the expression P/ 4πR2.P is the total power radiated y the source. As the distance of the point from the source increases, the magnitude of pointing vector decreases.

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