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He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633nm and a power of 0.550mW spread over a cylindrical beam 1.30mm in diameter (although these quantities can vary).
I = 414 W/m^2
E_max = 559 V/m
B_max = 1.86 muT
What is the average energy density in the laser beam?
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