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# Problem: A cylindrical laser beam has diameter 8.00 mm. The average energy density in the beam is 8.00 x 10-3 J/m3. What is the amplitude of the magnetic field in the beam?

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A cylindrical laser beam has diameter 8.00 mm. The average energy density in the beam is 8.00 x 10-3 J/m3. What is the amplitude of the magnetic field in the beam?

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