Physics, asked by balajisharmaa, 2 months ago

explain this phenomenon -number of field lines are subjective but density is objective​

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Answered by jayeshreddy
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In an electromagnetic field the flow of energy is given by the Poynting vector. For an electromagnetic wave, this vector is in the direction of propagation and accounts for radiation pressure. However, in a static electromagnetic field the Poynting vector can of course be non-zero. It's not easy to understand how there can be a 'flow' of energy in a static situation. Please discuss.

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