JEE Main 2024 Physics question
A plane EM wave is propagating along x direction. It has a wavelength of 4 mm. If electric field is in y direction with the maximum magnitude of 60 Vm⁻¹, the equation for magnetic field is:
Answer: (B)
Solution
B₀ = E₀/c = 60/(3 × 10⁸) = 2 × 10⁻⁷ T. The wave number is k = 2π/λ = 2π/(4 × 10⁻³) = (π/2) × 10³ m⁻¹, so ω = kc = (π/2) × 10³ × 3
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