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JEE Main2012PhysicsElectromagnetic WavesActual

A radio transmitter transmits at 830 kHz . At a certain distance from the transmitter magnetic field has amplitude 4.82 10⁻¹¹ ~T . The electric field and the wavelength are respectively

Options

  1. A0.014 ~N / C , 36 ~m
  2. B0.14 ~N / C , 36 ~m
  3. C0.14 ~N / C , 360 ~m
  4. D0.014 ~N / C , 360 ~m

Correct answer

D. 0.014 ~N / C , 360 ~m

Step-by-step solution

Frequency of EM wave v=830 KHz =830 10^3 ~Hz . Magnetic field, B=4.82 10⁻¹¹ ~T As we know, frequency, v= c aligned or & = c v = 3 10^8 830 10^3 & 360 ~m And, E & =B C=4.82 10⁻¹¹ 3 10^8 & =0.014 ~N / C aligned

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