exerts a force 
on a charged particle
yet the electric field of an EM wave does not contribute to the radiation
pressure (but transfers energy). Explain.
Answer:
Electric field of an
electromagnetic wave is an oscillating field. Due to it, the electric force
caused by electric field in em wave on a charged particle is an oscillating
one. This electric force averaged over an integral number of cycle is zero,
since its direction changes every half cycle. Hence, electric field is not responsible
for radiation pressure.
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