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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