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- Thread starter roboticmehdi
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Can you provide a reference for this? It is hard to say one way or the other without knowing the details.why do they say that electromagnetic field falls like 1/r ?

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Can you provide a reference for this? It is hard to say one way or the other without knowing the details.

http://en.wikipedia.org/wiki/Larmor_formula there in the part ''Derivation 2: Using Edward M. Purcell approach'' it says stuff related to this.

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http://en.wikipedia.org/wiki/Liénard–Wiechert_potential

If you look at the formula for the LW fields you see that for a stationary charge you get a 0 B field and a 1/r² E field, corresponding with Coulomb's law. If you look at the formula for the LW fields for a moving but not accelerating charge you get a 1/r² B field, corresponding with the Biot-Savart law. However, if you look at the formula for an accelerating charge you also get a 1/r E and a 1/r B field.

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Philip Wood

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