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NEET2017PhysicsElectromagnetic WavesActual

In an electromagnetic wave in free space the root mean square value of the electric field is E r m s = 6   V   m - 1 . The peak value of the magnetic field is

Options

  1. A1.41 × 10 - 8 T
  2. B2.83 × 10 - 8 T
  3. C0.70 × 10 - 8 T
  4. D4.23 × 10 - 8 T

Correct answer

B. 2.83 × 10 - 8 T

Step-by-step solution

Speed of electromagnetic wave c is given by, E r m s B r m s = c B r m s = E r m s c = 6 3 × 10 8 B r m s = 2 × 10 - 8 B r m s = B 0 2 B 0 =   2 × B r m s =   2 × 2 × 10 - 8 = 2.83 × 10 - 8   T

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