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Electromagnetic Waves Quiz-2

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10 Question

Popular Questions In Electromagnetic Waves Quiz-2

  • EM waves can transport energy;

  • The (instantaneous) energy density (energy per unit volume) of the electric and magnetic fields, of an em wave, are equal, respectively, to

  • It has been experimentally demonstrated that

  • The total energy transferred to a (perfectly black) surface of area A (located normal to the direction of propagation of the EM wave) and thickness d, by an em wave, over one complete cycle, can be expressed as

  • The intensity (I) of an em wave (having E0E_0 and B0B_0 as the ‘peak values’ for its electric and magnetic fields), can be expressed in the form:

  • The peak value of the electric field, in the light radiated by a given (point) source of power P, at a point distance r, from the source equals.

  • An em wave, originating from a source, is radiating out 10 J of energy per second. At a distance of 50 cm from the source, a perfectly reflecting surface, of area 8πcm28\pi cm^2, has these em waves incident on it. The average force, exerted on the surface, during a 30 seconds span would be

  • The rms value, of the electric field, in the em waves, produced a point source, at a distance of (4π)\left(\frac{4}{\sqrt{\pi}}\right) in from the point source, is 2Vm12Vm^{-1}. Taking ε0=8.85×1012\varepsilon_0=8.85\times10^{-12} SI units and C=3×108ms1,C = 3 \times 108 \, ms ^{-1}, we would find the power of the source to be (nearly)

  • The ratio, of the rms values of the magnetic fields in the em waves, radiated by two point sources, at points distance r and R, respectively, from the two sources, is ‘s’. If the power of one of the sources is P, that of the other would be

  • The peak value of the magnetic field, at a certain point, for an em wave is 9 nT. (It is given that μ0=4π×107\mu_0=4\pi\times10^{-7} SI units and c=3×108ms1c = 3\times10^8 ms^{-1}). The peak value, of its electric field, and its intensity, at the same point, would be (nearly)