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Q.

The magnitudes of poynting vector and electric field vector are respectively S and E, then

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a

$S = E^{2} \sqrt{\frac{ε_{0}}{μ_{0}}}$

b

$S = E^{2} \sqrt{ε_{0} μ_{0}}$

c

$S = E^{2} \sqrt{\frac{μ_{0}}{ε_{0}}}$

d

$S^{2} = \frac{E^{2}}{μ_{0}}$

answer is A.

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Detailed Solution

$S = U \times C$

$S = ε_{0} E^{2} \frac{1}{\sqrt{μ_{0} ε_{0}}}$

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The magnitudes of poynting vector and electric field vector are respectively S and E, then