Question
GeneralGeneralGeneral

A laser beam has intensity 4.0 × 1014 W/m2. Find the amplitude of magnetic field associated with the beam.

Verified Answer

Solution:

Intensity of electromagnetic wave:

I = (c × B2)/(2μ0)

Where:

  • I = 4 × 1014 W/m2
  • c = 3 × 108 m/s
  • μ0 = 4π × 10-7

Rearranging:

B = √[(2μ0I)/c]

Substituting values:

B = √[(2 × 4π × 10-7 × 4 × 1014)/(3 × 108)]

B ≈ 1.83 T

Answer: 1.83 T