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NEETPhysicsMagnetic Properties of Matter

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): When an electromagnetic wave travels from vacuum into a non-magnetic dielectric medium, its propagation speed ( E₀/B₀ ) decreases but the ratio of electric field amplitude to magnetic intensity amplitude ( E₀/H₀ ) increases. Reason (R): For a non-magnetic dielectric medium, relative permeability is

Options

  1. ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
  2. BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. C(A) is correct but (R) is not correct
  4. D(A) is not correct but (R) is correct

Correct answer

D. (A) is not correct but (R) is correct

Step-by-step solution

The propagation speed of an electromagnetic wave is given by v = E₀ B₀ = 1 . The ratio of electric field amplitude to magnetic intensity amplitude (wave impedance) is given by E₀ H₀ = . For a non-magnetic dielectric medium, the relative permeability _r = 1 (so = ₀ ) and the relative permittivity _r > 1 (so > ₀ ). Substituting these values, the speed becomes v = 1 ₀ ₀ _r , which is less than the speed in vacuum ( c = 1 ₀ ₀ ). Thus, the propagation speed decreases. Similarly, the ratio E₀ H₀ becomes ₀ ₀ _r , which is

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