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# Write the relation between the magnitude of electric and magnetic fields in an electromagnetic wave with speed of light and hen

15) Write the relation between the magnitude of electric and magnetic fields in an electromagnetic wave with speed of light and hence find the magnitude of the electric field at a point in space and time if the magnetic field at that place is 2 X 10-8 T.
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Relation between magnitudes of E, B and c is $\Rightarrow E = cB$

$\Rightarrow E = 3\times 10^{8}\times 2\times 10^{-8}$

$E = 6\: V/m$

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