In a plane EM wave in free space, electric field frequency is 2 × 10¹⁰ Hz and electric amplitude is 48 V/m. Given c = 3 × 10⁸ m/s, the magnetic-field amplitude is:
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Question

In a plane EM wave in free space, electric field frequency is 2 × 10¹⁰ Hz and electric amplitude is 48 V/m. Given c = 3 × 10⁸ m/s, the magnetic-field amplitude is:

G1 Physics · Accepted Answer

Step 1: For a plane wave in vacuum E₀/B₀ = c. Step 2: B₀ = E₀/c = 48/(3 × 10⁸). Step 3: B₀ = 1.6 × 10⁻⁷ T (option A). Final answer: (A) 1.6 × 10⁻⁷ T.