Q161 / 200 · Manipal (MET) 2012 · Physics

In an electromagnetic wave, the electric and magnetising fields are $100 \mathrm{~V} / \mathrm{m}$ and $0.265 \mathrm{~A} / \mathrm{m}$. The maximum energy flow is

  • Correct answer
    A
    $26.5 \mathrm{~W} / \mathrm{m}^2$
  • B
    $36.5 \mathrm{~W} / \mathrm{m}^2$
  • C
    $46.7 \mathrm{~W} / \mathrm{m}^2$
  • D
    $765 \mathrm{~W} / \mathrm{m}^2$

Solution

Maximum rate of energy flow, $S=E_0 \times H_0$ Given, $E_0=100 \mathrm{~V} / \mathrm{m}, H_0=0.265 \mathrm{~A} / \mathrm{m}$ $\therefore \quad S=100 \times 0.265=26.5 \mathrm{~W} / \mathrm{m}^2$

Hence, the correct answer is option: 'A'.

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