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A laser beam has intensity 2.1 10¹⁵ ~W / m ^2 . The amplitude of magnetic field in the beam in approximately is

Options

  1. A1.4 T
  2. B4.2 T
  3. C1 T
  4. D1.5 T

Correct answer

B. 4.2 T

Step-by-step solution

I = B ₀^2 2 ₀ C aligned & 2.1 10¹⁵= B ₀^2 3 10^8 8 10⁻⁷ & B ₀^2=17.64 & B ₀=4.2 ~T aligned

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