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Magnetic field propagation in free space

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A magnetic field propagating in free space is given by

$$ H(z, t)=20 . \sin \left(\pi \times 10^{8} \mathrm{t}+\beta \mathrm{z}\right) \mathbf{a}_{x} \frac{\mathrm{A}}{\mathrm{m}} $$

Find \(f, \lambda\)

physics   Electromagnetism   Electrical-Engineering   Computer-Engineering   science   
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