A laser beam has a radius of 1.4 mm. How powerful does the laser have to...

Question

Question

A laser beam has a radius of 1.4 mm. How powerful does the laser have to be for the maximum magnitude of the magnetic field in the beam to be 6.0 μT?

science physics

Answer 1

Answer #1

Intensity of EM wave

= (3*10^8 /(4pi*10^(-7)) ) * 36*10^(-12)

= 8594.36692696

Power / (pi * 0.0014^2) =8594.36692696

Power = 0.05292

Answer 2

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