NEET2017Physics-Electromagnetic Waves

NEET 2017 Physics Electric and Magnetic Fields MCQ Question

Type: MCQ-numerical-Medium-Class 12

In an electromagnetic wave in free space the root mean square value of the electric field is Eₘₛ = 6 V/m. The peak value of the magnetic field is:

A

1.41 × 10⁻⁸ T

B

2.83 × 10⁻⁸ T

C

0.70 × 10⁻⁸ T

D

4.23 × 10⁻⁸ T

Correct Answer

Option B

Detailed Explanation

The peak value of the electric field E₀ = √2 × Eₘₛ = √2 × 6 V/m = 8.49 V/m. The peak value of the magnetic field B₀ = E₀/c = 8.49 V/m / (3 × 10⁸ m/s) = 1.41 × 10⁻⁸ T.

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