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JEE Main & Advanced Physics EM Waves Question Bank Self Evaluation Test - Electromagnetic Waves

  • question_answer
    An LC resonant circuit contains a 4 pF capacitor and a 10 mH inductor. It is set into oscillation coupled to an instrument. The wavelength of the radiated electromagnetic waves is:

    A) 355 cm   

    B) 377 m

    C) 400 mm 

    D) 600 mm

    Correct Answer: B

    Solution :

    [b] \[v=\frac{1}{2\pi \sqrt{LC}}\] \[\lambda =\frac{C}{v}\Rightarrow \lambda =C\times 2\pi \sqrt{LC}\] \[\lambda =3\times {{10}^{8}}\times 2\times 3.14\times \sqrt{10\times {{10}^{-3}}\times 4\times {{10}^{-12}}}\] \[=377m\]


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